VW Germiston broke my car

I'm really disappointed in the vw Germiston... I took my wife's car to repair a simple drop that was not a big deal.... A week later a car returned worse.... And one can imagine how steep the bill was.... In the middle of the highway during morning peak hours the car stalled and died.... We had to arrange our own tow truck to take the car back to vw Germiston..... The car was there for 2 week +.... And we were told the car is fine.... Hardly a week of getting the car back.... There was funny sound in the engine.... The car had to go back again.... This time around the car was there for over a month.... Then we were told the car is fine there shouldn't be anything wrong.... Two day after getting our car back.... The car switches off every time we start it.... And the idle is not stable We feel that have wasted a lot of money trusting that vw knows theirs products and the car was in good hands.... I would have been better driving a car with that 1 tiny drop of oil than this mess