Audi Pietermaritzburg Unacceptable Service provide

I simply requested a minor service from Audi Pietermaritzburg and all I am getting is one problem after the other. Firstly Audi forgot to re-fill my oil tank after a simple minor service that entails changing my old oil and fitting new spark plugs. This matter was ***********ly justified by Audi Pietermaritzburg through conducting an oil consumption test that I had to pay for. Note my car was in good condition and had no oil technical issues before the service. When my car was booked in for the oil consumption test the radio of my car returned to me and had been tempered with and damaged. When I received my car, Audi had the audacity to return it to me with a radio that malfunctions. Both my issues have not been resolved and all I am experiencing is one problem after the other, all because of a minor service. How does my radio get affected in a sense that my cd player does not function when a simple oil consumption test is being conducted. I am not happy with the customer service that I have received from Audi Pietermaritzburg due to the inconveniences caused by certain individuals within the infrastructure of the Audi Pmb Branch and I have been treated unfairly .