Bad service,negligence, disrepect by Audi South Africa and its dealership NTT Audi East London

I reported bad customer service and negligence of an Audi dealership based in East London to Audi South Africa.Instead of dealing with issues that i have raised ,they are justifying actions on the NTT Audu Centre in East London.My car that has been with them for maintenance for 2 months broke down an hour after collecting it from the dealership.This happened on the 23rd of February.I went to East London from PTA to go collect the car.During the 2 months the car was with them their technician damaged the fuel pump ,camshaft and valves.They replaced them at their own cost.This is an admission of guilt in my eyes.But when my car broke down after picking it,the refused to take responsibility claiming that had nothing to do with the timing chain/valves they replaced which i paid for.They could not even send a technician to come and assess what could be the issue after the car was in their workshop for 2 months. If 3 parts can be damaged by their technician what guarantee do i have that no further damage to the car occurred as a result of their negligence which they ave proven? I have had to tow the car to Jhb at my cost as NTT Audi blatantly refused to assist not to even check what could be problem .Audi SA what kind of customer care standards you hold your dealerships to?I have been left with the bad taste in my mouth , am done with Audi as a brand .I have just been shown the middle finger by you