FRIDGE WORKED/REPAIRED for ONE WEEK ONLY - PATHETIC SERVICE

requested repair work for my fridge on 18th April which wasn't cooling off and was charged R2800 and paid cash. on the 1st of may my fridge was back to the same problem which basically it worked for a week and they claim that they have 6months guarantee. when I contact them I'm promised that the technician will come and check it. I just want my money back. be careful guys about this company - total rip-off