Trendyol Coupon Missing After Wrong Shoe Delivery – Complaint

I purchased a pair of Timberland men’s yellow boat shoes from the seller Tnj Outdoor via Trendyol under order number 11355759840 on 25 June 2026. I ordered size 43.5, but I received size 42 instead. I initiated the return process and, after a long wait, my refund was finally processed. As an apology for this mistake, a 500 TRY discount coupon was credited to my account. However, I was never informed about the coupon. I later learned that the coupon was set to expire on 18 July. When I tried to use it on 17 and 18 July, it did not appear in my coupon section at all, so I was unable to benefit from the discount. I contacted Trendyol Live Support, clearly explained the situation, and requested that the coupon be reissued. During the live support conversation, I was told that there was a system-related issue and that, due to this, they were not even able to create a complaint record regarding the coupon. No concrete solution or assistance was provided. I consider this situation unfair, both because I was first sent the wrong product and then prevented from using the compensation coupon that was given as a goodwill gesture. I kindly request that the 500 TRY discount coupon, which was issued as compensation for the incorrectly delivered product, be reissued in a way that allows me to use it without any technical issues, or that an equivalent form of compensation be provided to remedy the inconvenience and loss of goodwill I have experienced.