Really, please just stop. You clearly cannot manage this business.
You advertise delivery time of 3-8 days, for contacts you say it will be calculated when I put my numbers in. It said 5-8 days. I waited more, I wrote emails. In the last email it said I must wait for another month. For a contacts user it's just not how it works.
What you are doing is called false advertise and unfair competition and IMO that should be prosecuted, but we're in Germany, so you're kinda lucky customers are not protected at all here and you can do just fine with your copy-paste standard replies.
BTW your competitors delivered me my contacts next day.