Telefunken smart TV

I purchased a Telefunken smart TV from game online in September 2024, within the first day of use the screen went blank I had it returned after much back and forth they collected the TV several days later then promised to send me a new TV which didn't happen I had to go to the store and get another TV which also didn't go smoothly cause apparently the system was offline and I couldn't get a receipt for the TV. Many days later I get a photo copy of the receipt emailed to me cause I phoned and insisted for a receipt now just over a month later the new TV has an issue with lines running across the screen and colours on the screen. I immediately call the customer service to notify them about what's happening and state that I no longer want this TV as it seems to be an issue with the ,55" Telefunken smart TVs because this is my 3 Telefunken TV in 2 years from game and the first TV just fell out of warranty hence me buying a new TV. I call there customer service daily every day they say that a technician will come out and fix the issue or if need be take the TV to have it assessed it's been 10 days and no help all I hear is excuses I want a refund