Dishonest Service

On the 18/08/2015 I drove my car in to BMW as I was having starting problems . I was advised that they will check what the problem is. I was also advised that if don't accept the quote I will need to pay R 850. After checking I was told that the problem was with the timing, of which I was quoted about R4000. I agreed for them to proceed with the quote, however, after the timing was fixed, my car was still problematic according to the work manager. Apparently now the new issue was that the car couldn't rev and that the problem was with the vacuum pump which was leaking (or something). The new quote was now R6378.77. After they fixed it, I was told that now there is a new problem with the air flow meter and coil. According to them, this was no longer an issue and real issue was with the wiring and I have to pay R5000 (on top of the R6378) as this job requires 5hours (R1000/hr just to check NOT fix) - according to the manager. I then asked if this would finally solve my starting problem and the manager said that he is not sure.Why must I pay (about R 7000) if my car is worse and why have a diagnostic tool if it can't detect the issue.UNACCEPTABL -BareInMind I still have no car??