Defective Shirt Replacement Blocked - Store Refuses Contact

Dear Trendyol Support Team, I purchased one “Tactical Cotton Shirt” from the seller Taktik Store via Trendyol. I received the product on Saturday, October 4th, and upon inspection, I noticed a defect on the sleeve cuff (manufacturing flaw). I immediately submitted a replacement request to the seller through Trendyol Assistant. However, four days have passed, and I have not received any response from the seller. I also tried reaching out through multiple channels — including WhatsApp, Messenger, and the “Ask the Seller” section on Trendyol — but I have not received any reply through any of these means. Furthermore, I attempted to contact the seller via the phone number listed on their store page, but no one answered the call. When I contacted Trendyol customer service, I was told, “There’s nothing we can do; after three days, you can open another request, which will also have a three-day waiting period.” As a result, the process has remained unresolved and without proper communication. The package and shipping were both in good condition, with no visible damage. I would like to request a product replacement as a priority, and if that is not possible, I would like to request a refund. On other e-commerce platforms, similar situations are handled much more quickly and effectively, so I kindly expect both the seller to prioritize customer satisfaction and Trendyol to offer a more efficient and solution-oriented process for its users. I kindly request that the necessary action be taken to resolve this issue.