SELL DAMAGE GOOD - X2 FRIDGES BOTH NOT WORKING

I bought a fridge at Game, bayside mall on the 27/02/2015. In the first 7 days i phoned game to tell them the freezer freeze top and bottem and after that it didnt do anything and all my food go waisted. And they replaced it after a month The second one is even worst. Its doing the same everything is freezing and its not going off. Its now a month since Winston told me they are going to send the technicians to check it but i am still waiting. Bradley told me i have to pay a extra R500 if i want a new freezer. And i paid cash for the freezer now they want me to pay again for something i all ready paid for. This is really unacceptable service. please help.