Misdiagnosis and poor service

I took my car to BMW menlyn auto 2weeks ago. They took it to the workshop and called me to tell me that certain things like fuel pump sensor need to be replaced and other things. 3days down the line they called me to explain they installed wrong parts and new ones were ordered from BMW sa. 2days later i was told my car bombed out and theyre busy reprogramming it. Wen i was called in this monday after they had my car for 2weeks i paid and was told ive got 24months warranty. I drove 3km and i got stuck in the middle of the road. They came over and there was oil all over the pavement. They towed it away and an hour later they called to say theres oil leak and other things needed to be replaced. Things which were not diagnosed 2weeks ago. Oil leak cannot be missed during diagnosis. I took my car to them driving it,and they did not tell me about any oil leak. 3km drive and suddenly 3things are broken and theres a new quotation of R25k. Can someone please advise these people to take their technicians for training. -Dr Lekota ********** 326