How many times does a device need to be fixed just for one to enjoy their purchase?

I have bought a 55' Hisense TV and have had it fixed twice already. Every time my TV gets fixed works for a bit and then bombs out on me. The last thing replaced was the motherboard 2024-12-10 but now I have issues with having my TV flash pink and then go blank,after switching off the power supply it resets works for a bit and then again goes off. Now it’s December how does one enjoy the festive season of finally getting to rest and watch he soccer. Since the first time I have called to get my TV fixed they have tried to use warranty as some excuse which I am still within. I don’t know if the deal is that they waiting for it to be out of warranty and then I’m stuck with a broken TV… I don’t want this TV anymore and have emailed them .As I wait for a response because I was told they are closed ,I will keep my complaint here updated. I want a refund or new TV ASAP. It’s December for goodness sake…😡