The worst service ever

I took my car to these people in Jan was advised that wiring needed to be fixed and there is wires completely cut from the engine that they had to replace, Gave them a go ahead and was advised the injectors are not right took them back to a place that fixed them and they fixes them again and delivered the injectors to Bosch themselves, came back injectors still not right ,they advised that the injectors were not the same injectors that were in the car that's Bosch saying, here I went and logged an inquiry with Ombudsman against the company that fixed the injectors, now I go to Bosch as they tried calling me and they advised my bill is R12 000 for everything that has been done so far and I ask to see the work done and they saying the wiring is not done so they need to take it out and my question is how do you see if injectors are faulty if the wiring is not done and I called a number of times and asked is the wiring done now as they were waiting for the injectors and was advised it's all done they just waiting in the injectors and now it's a different story why?I then asked for a manager and she asked for us to give the information to someone to take UT to her office and we refused asking to speak to her directly, She came out shouting telling us she is the manager and she is the one asking for the Info,We said we would like to talk to her in her office and she said you not getting in my office I can give you the number and email for the ombudsman they are registered with them and they are a reputable business and we had a screaming match right there with her