Substandard TV- Not working barely a month after Purchase

I recently got a 55-inch TV from Hisense. It was purchased from Makro on the 19th of August 2025. As of the 14th of October, the TV no longer works as it should. I have tried contacting the company, and they sent a technician who did absolutely nothing but take photos. Now, I am contacting them for feedback, but I receive no tangible answer. This brand is giving me sleepless nights, and my family is left in disarray as the TV is the only source of entertainment in my household. I can't believe that R.5699 may get me a substandard TV and get no assistance whatsoever.