Major Service Gone Wrong

On the 24th of November 2015, I took my car in for a major service. I then collected a car the very same afternoon, before taking the car during the handover by Johan(service advisor) I inspected the car and this were the wrongs I found.<br> 1. The right rear light housing was loose, meaning quality assurance was not done after the car got finished to be serviced.<br> 2. Started the car and began reving it, and I heared a foreign sound which I immediately asked why is the car doing that as its the first time hearing the sound and the technician said to us(my two colleaques) the turbo detachment from something I do not know. I therefore took the car and drove off. I used the vehicle to go to work thereafter which is approx 900m from where I stay. Later that week on Saterday I drove to Joburg and on my arrival I realised the car had begun to idle like its a diesel engine. I drove back from Joburg and took it in for a check up, but I did not receive a call throughout the whole day and only when I got there I was told that they need R4000 from me to st******* the engine. I asked them why would my car idle like that especially after the major service to this day they have not said a word.