How to be ripped off

I booked a callout and was told i had to pay R650 up front. The callout never happened, so I visited their shop in Victory Park to find out what had happened - wrong info recorded. I told the person in the shop exactly what was wrong with my filter and what needed fixing. So on Wednesday, a team arrived, looked at it, and told me they don't fix filters!!!!!!!! *** I knew it was the filter - I showed the person in the shop exactly what was wrong on one of their filters and they charged me R650 for the pleasure and said that there is no refund. I then telephonically contacted their head office and was told the area manager is not available and will call back. Still Waiting - COMPLETE ******* ARTISTS