Cash crusaders is ****ming customers

I bought a second hand 55 inches telefacan TV at cash crusaders Worcester on the 16 of November 2024 they told me the YouTube and Netflix were outdated but the TV was fine. 2 weeks later the TV went blank and only sound come out. I sent it back I went back yo check on the TV 3 times still their couldn't fix it and I went back this Friday and now their telling me they can not fix the TV because they warrant doest cover insects damage. When I asked them how is that it has insects damage when the TV was with me 2 weeks and with them almost 2 months. Now they don't want to refund me. Their want me to just take the TV back home