Shocking service at SMG Umhlanga!

My wife brought her car in for service on the 2nd of January because of an idiot petrol attendant who didn't replace the cap when she was filling up on engine oil. SMG charged her for diagnostics and servicing the vehicle. One of their service staff then advised her that they had picked up another service requirement which was not related to the initial issue that the car was brought in for. We told him not to repair/replace whatever that was because we didn't have the kind of money they quoted us for. It turned out that they did that anyway and expected us to pay. I told them to remove whatever was installed and paid only for the initial repairs. My wife took the car home only to find out that the engine is now overheating. She reported this and was told she needs to tow the car to the dealership at her own cost so they can diagnose the issue(at a cost). We have been trying to escalate the matter with the service manager since the beginning of the month and we are repeatedly told he is unavailable. I do not recommend anyone take their vehicle to those ****** at SMG Umhlanga!!!