Vestel Failed to Fix Buzzing Issue on My Toshiba 65QL5D63DT TV After Multiple Repairs

I purchased a Toshiba 65QL5D63DT television in June 2024, and after a while, it started making a buzzing noise from the back while in use. I contacted Vestel’s authorized service, reported the issue, and a technician visited, diagnosing the problem as an issue with the electronic card. They informed me that a replacement card would be ordered and installed upon arrival. Two days later, they returned, replaced the card, but after the TV ran for 15 minutes, the same buzzing sound returned. I reached out again, and this time they said the issue was with the LEDs and that they would need to take the TV to the service center. After keeping it for 15 days, they brought it back with the message that it had been “repaired and checked.” However, just 10 minutes after turning it on, the same noise was back. I am frustrated with Vestel and the service team, who barely tested the TV and left me without it for two weeks, only for the problem to persist. I had to take time off work each time they came, and the issue is still unresolved. I am requesting a full replacement of this TV and a proper resolution of my complaint. I plan to bring this matter to relevant institutions, including CİMER and the Consumer Arbitration Board.