Nightmare Service from Game

I bought a Sinotec tv at Game Wonderpark shopping center. The tv had a cracked screen. I returned it back and they refused to refund or accept liability. They threatened to beat me because I refused to accept liability. They asked that I wait for the person that sold me the two tvs. I waited two hours for that person and when he finally arrived he refused to speak to me. I spoke to his manager and he told he'll deal with his staff members but will not refund or accept liability since I have no proof. I asked them to check their cameras to proof that they did not check the tv before it left their store and they refused. I have asked them what I need to do since we in disagreement and was advised to do whatever I want. I left the store and their tv.