very sad and unhappy

so my wife and i bought this tv at the game store in canal walk cape town and just within one year the stop stopped playing so we took the tv back to the store but we lost the original receipt..so they asked the day and year we bought the tv and we told them..they then said to us that they will call us when they retrieve the duplicate then after a month or so they called us that they have found the duplicate receipt so we must bring the tv okay they gave us proof as in they were gonna fix the tv or change it for us we waited and waited now after two weeks or more they called us that our tv is back at the store for collection the whole family was happy we all went to the store and only for them to tell us that their supplier says they can't fix or change the tv for us without the original receipt... like really so a tv that we bought at the cost of close to 7000 rands just within one year will go waste like that...is that how a game store do business...what's the south african consumer protection says about this ....i think we have been subjucted to exploitation