Wissel.nl double-sells Zalando gift vouchers.

You will be alright if you buy a voucher and use it immediately.
I bought several Zalando gift vouchers in 2024 (300+ euros worth), activated them, and placed Zalando orders on the same day as I purchased the vouchers. All gift vouchers in the Zalanado account overview had a validity date of 2029. I returned some items, so Zalando dutifully restored the balance.

However, a few months later, vouchers started to disappear from my Zalando account. I contacted Zalando, and they explained that multiple users use my voucher codes.
I contacted the klantenservce of Wissle.nl. Jeroen reimbursed the first fraudulent code; for the second one, he reimbursed only 50%, stating "to share the pain." There is no answer from the klanterservice, nor reimbursement in relation to other vouchers.

Wissel is aware that they are committing fraud by double-selling coupons.
Zalando confirmed the fraud of Wissel, saying that they have received multiple reports of this kind of issue.

Update. In response to the answer to my review. Clearly, Wissel.nl klantenservice shifts the topic. Instead of addressing the issue of multiple coupons being double-sold, they stated that they reimbursed 50%of one coupon, blaming me for reporting the issue months later.

Again, the issue became evident months later, as the valid Zalando coupons disappeared from my Zalando account.

This is fraud! I saved Zalando chat transcripts where they informed me that coupon codes supplied by Wissel are shared by several users.

Also, If you buy a gift card on the 29th of December 2024 and enter the code on the Zalando website, the validity date is 29.12 2029. I have confirmation of this too, all screenshots are saved. If you buy and return an item within the time allowed by Zalando, the balance restored by Zalando should remain valid till 2029!