Bad service

Hi my name is Nomvula I bought a TV at best electric stores it was 09/2018 in January 2019 it got broken the screen went black only voices you could hear so I took it back to the store got it fixed and came back to me, now in August it gave me the same problem I took it back to the same store and I told them I don't want it since it keeps on breaking I need a new one or money back to my surprise I was told they can't refund me until it got fixed for the third time, that is not what their return policy tells plz help