congstar Reviews 

They rejected it without any reason. Wanted to change the network. But then I realized O2 is better cause they’re more friendly & easy to get stuffs around compared to them.

So far so good!
The process of getting the sim was quick and easy. I had all the necessary documents so it wasn’t a hassle at all. Delivery was quick too.
Thanks to the team.

Very bad service. They sent me the wrong SIM card number, which I had requested previously. After calling them 3 times, they activated the wrong SIM card that was sent to me. They told me that the correct SIM card would arrive within the next 3 days. After a week, nothing had happened. I had to call them 4 to 5 times again, and then they finally started processing the shipment of the correct SIM card. But even though the correct SIM card still has not arrived at my place, they deactivated my previous SIM card. So I am not reachable for the next few days until the correct SIM card arrives.

Had some issues regarding downstream speed, never reached the contractually promised "up to 50 mbit/s", on average only half that. There's a law for exactly this situation, stating that the customer can expect a discount when there is "significant, continuous or regular deviation" (§ 57 TKG (4) 1.). After some back and forth with customer service, with me insisting they stick to the law and give me some discount, the statement was "maybe congstar isn't for me and I should change the internet provider". I still insisted and asked for some statement from a lawyer regarding § 57 TKG - no further messages since. Great company!

they fined me in 300 400 euro

i left DE to america without doing abmeldung

and without the abmeldung they couldnt stop the contacts so i was fined for not paying them

then at the end i had to wire 618 euros so they wouldnt report me to SCHUFA

Super ! with you !!!!!!!!!!!!!!!!!!!!!!!!!

I have been a loyal Congstar customer for several years, but my recent experience with their customer service has left me incredibly surprised, frustrated, and angry.

It genuinely makes me wonder whether Congstar has replaced its entire customer support with AI that is instructed to answer no questions and lose customers as quickly as possible.

Last month, I was not charged at all for my account. Then this morning, despite claims of multiple attempts to contact me, there was only one email and no letter or phone calls. That email stated that my phone payment plan had been cancelled and that I now have to pay the full remaining amount immediately.

I contacted customer support to ask a very simple question. Why was I not charged, and why was my contract cancelled without proper notice?

The response I received was literally the same email again, copied and pasted, with no context, no clarification, and no actual response to my question. There was absolutely no indication that a real human being had read my request.

At that point, any hope of staying a Congstar customer disappeared.

I would strongly warn anyone against using this company. Otherwise, you might wake up one morning to an email telling you that you suddenly have 700 euros less for Christmas presents, with no warning, no explanation, and no way to speak to a real person.

Extremely disappointing and unacceptable.

I ordered my internet from this company weeks ago and I still don';t have internet set up. FIRST PROBLEM: I organised a direct debit to make payment smoother. They took a day to check the direct debit and by the time they had, my chosen tarif had gone up by €3/month. When I called to say I'd ordered it on the cheaper tarif, they told me "That was yesterday's tarif"... YES!!! And yesterday was when I ordered it. Checking my direct debit is on your time so why do you charge me at the new tarif? SECOND PROBLEM: It has taken them one month to organise an appointment. The day me and my housemate have been preparing ourselves for, they come, but don't even ring the doorbell. They call my phone while I'm in the toilet so I miss the call. I can't call back as it is a number that doesn't accept calls. When I call Congstar I'm told that I have to wait another 10 days for an appointment. Then he puts the phone down on me without booking the appointment. I mean this is 2025, almost 2026, to wait 6 weeks for internet is insane. What is your problem Congstar? You definitely do not value your customers ...

Can someone finally respond to my emails? You are attempting to cancel a service that I have already paid for! This is completely unacceptable.

You seriously need to fix your payment platform before offering customers long-term contracts. Ever since I switched to this plan, your system has repeatedly failed to record my payments, and now you’re cancelling my subscription again. How is it even possible that I’ve supposedly been using my phone without paying for 15 months? Are you serious?

Please resolve this issue immediately and stop sending me these pointless and frustrating emails. I expect a clear explanation and confirmation that my service will remain active without further interruption until my next payment in December.

Very easy to use, lots of info, plus a very fair price. Easy to get a new tariff & cancel as well.

Terrible. In the beggining everything was good. When we received a router, the Internet wasn't there so we asked for an appointment with specialist to take a look what's wrong. First one, nobody arrived and I was waiting for 6 hours. Second one, nobody arrived; hotline said that this appointment wasn't in their system (which is not my problem). Third one, man arrived, didn't even ring the door. I met him outside and asked if he was from congstar/telekom. He said "no", sat to the car and left. 3 min later we receive a notification that nobody was at home and specialist didn't manage to reach us (he didn't even call via phone...).
We quit the contract, but congstar still takes money from our bank account. I absolutely don't reccoment this provider.

I topped up 100EUR 5 days ago for the yearly package and the service is not working, I still don’t have data, I’m completely lost when I’m out and about. The customer service hasn’t responded to my emails. The worst.

Horrible company that does not care. "Technicians" on support chat lie and constantly say that "modernization" is in progress and that it will be resolved in a couple of days. When I reach again after the date they gave, they say the same thing again, just with another date. This goes on forever.
It worked at first (2 years ago) and progressively got worse as time went by. Now I can't even work with 0.5-3 MBit/s in BERLIN? I wonder how this service works in the middle of nowhere!

No real value for money.
Bad connection, expensive internet options and no prorated services when changing subscription plan.

No invoice for my prepaid credit. Why not?

UPDATE: I also don't see any receipts in the web app dashboard of Congstar.

Congstar has very good tariffs tailored specially for the needs of its customers. Their mobile Application is effective, efficient and functional. If only they could activate tariffs sooner than 24 hours, that would definitely get them 5 stars.

Signed a new contract, had working WiFi for 2 days. Then the whole disaster started. Multiple employees of congstar didn’t know what to do, technicians came 4 times without avail. By the time I gave up and told them to terminate the contract they told me that I had to keep the router. Worst customer experience in my life

Have been using congstar for a few years now and had nothing but trouble. Couldn't get back into the app and when I called the support hotline they were just not helping and rude. I was yelled at and told that I'm not listening. When I asked something I got the same reply over and over again.

I really like congstar. I’ve been using them since I have arrived in Germany for like 9 years. The app is obviously in German but easy to understand and the customer service has always been SUPER kind to me and helpful and offers support in English. You used to have to wait a while for the sim to arrive but that’s anything by post in Germany. Now with eSIM it’s super easy and immediate. For us non commitment folk I highly recommend. I use the month to month and it’s awesome.