Faulty TV and Hisense doesn’t care

I bought a Hisense TV from Makro Wonderboom in July 2025. Since purchase it has had a fault where the channels change on their own repeatedly. Hisense sent technicians twice in the last 10 months. The motherboard was replaced both times, most recently on 16 May 2026. The issue is still happening, the TV is less than a year old and still under warranty. Worst is that I sent an email on the 17 May and they never revert, it’s honestly disappointing.