Leaders in bad service.

This so called gearbox specialist quoted me R8500 to repair my Chev gearbox, I took the box in, and then decided that I want them to install the new one for me, Now they come with all different excuses, then this is broken then that, they damaged my car, and now when I complain they say I am childish. Thursday, this so called geabox specialist informed me that the car is running, so they just need to test run it, Later that same day they turn around and say the car doesn't start. Now the owner Ferdi says to me that how must they know that I am not lying, and that the car didn't run, even before I brought the car in.