I feel ****** by Audi Polokwane

I took my car to Audi Polokwane, an Audi A4 for full service. I was told that i must pay an amount just over R25 000 (Twenty five thousand) for my car to be fully fixed. An amount i gave authorization for and later paid for. What i was chiefly informed was that my car is no longer overheating by the service adviser. While driving my car the same day, i noticed that the car was still overheating. I phoned the dealer and informed them about the matter, i was told to make time and bring back the vehicle to them for further assessment. I gladly did as advised. I was later phoned by the dealer to pay a further amount just over R5000 for the vehicle's overheating problem to be fixed, an amount i fully paid when i was told that the problem has been solved. When i drove the vehicle just less than 40 Killos, the car started overheating. I phoned the dealer and i was told to bring the car back to them. I took the car to the dealer the same day. I was phoned after few days that i must pay another further amount of more than R5000 for the overheating problem to be fully solved. The car broke down within 50 killos of driving and I was told by the dealer that the while engine is damaged.