Car service city is unable to service a basic car after taking the car back 3 times

I took my car in for its annual service to Car Srrvice City in Rivonia and there were no issues with the car. Previously it was serviced by the dealership but is now out of motor plan. R5400 later and having taken my car back 3 times in one week, there is now a new warning light that keeps coming on that did not appear before. I went to the head office in Sunninghil and first being **** to by Danny where the head office was (apparently it’s on the second floor at Cambridge office park where I was), nobody was prepared to assist. Vanessa from complaints also are not assisting. I’m looking for a full refund as I now have to take my car back to the dealership as I have no faith or confidence in their ability. It was only suppose to be a normal service costing R2000 and I now have know idea if the coil springs that had to be replaced was also not damage caused by them. The alternative is that the Fiat dealership damaged it in my previous service.