Charged for unneeded/fictitious repairs

Sent my playstation in with suspected power supply problem. Got it back a week later with R1550 invoice for power supply replacement. After complaining reduced to R1150. <br> Plugged it in - still dead. Sent it back, and got it back 4 days later - explanation circuit board problem that was only discovered now also had to be fixed. <br> Plugged it in, still dead. Now I am very suspicious, so I try another electrical cable - miraculously it works. The problem was the R30 cable all along. I was charged R1150 for this, and I still have to find my own new electrical cable.<br> They can't prove that the power supply was replaced. If it was, it was not necessary, the machine worked fine when they plugged it in using their cables.