Samsung Galaxy A26 Has Audio Issues - I Got No Support

On June 26, 2025, I bought a Samsung Galaxy A26 smartphone via Trendyol, along with a wired headset to listen to music. However, within a minute of using it, I noticed severe static and sound distortion. Assuming the issue might be with the headset, I tried another one, but the problem persisted. On Saturday, July 12, I visited the Samsung Authorized Service near my home and explained the issue. They said they couldn’t help because I wasn’t using an original Samsung headset. When I asked about the price of an original one, they said it was around 1,000₺. I mentioned that I saw it online for 590₺, and they replied, “Everyone can sell it at their own price.” I asked them to test with any available headset, but they refused. I then ordered an original Samsung headset online, which arrived on Thursday, July 17. Unfortunately, the same issue occurred. I returned to the service center, where the customer representative Ms. D*** remembered me. I showed her the new original headset. At first, they claimed it wasn’t genuine, but after comparing it with the one on their own stand, they admitted it was. She took both the headset and the phone to the technician. A few minutes later, she returned saying there was no issue. I demonstrated the problem myself, and she went back again. This time, she said the headset was faulty and the phone was fine. I explained this was the third headset I had tried, but they still insisted the phone was not the problem. When I asked what would happen if I bought a headset from them and had the same issue, they said no refunds would be given. To make things worse, I was told to “use wireless earbuds” instead—an unhelpful and dismissive response. I asked to speak directly with the technician but was denied due to company policy. In the end, no real solution was provided. I now have three working headsets and one phone that clearly has a problem. I expected better from a brand like Samsung. I am requesting a refund for the headsets and a replacement for the defective phone.