Poor workmanship and lack of compeyent mechanic at Pinetown Audi garage

Poor workmanship at Pinetown Audi garage. Took the car for common rail fuel pressure low. Firstly they asked me to pay R3500 to order a part which cost R530. Whats disappointing is that they wanted to do test already conducted by another mechanic nd they say its their procedure. I finally allowed them since i needed my car to be fixed. Diagnostic nd pressure test completed. One pipe on injector number 3 found to be leaking nd thety proceeded with the repairs. The next thing I get a call nd told there is another leaking pipe of which I disagreed based on the pressure test results. I opted to take my car to another mechanic within an hour where they say its leaking it turn out to be a loose bolt on the injector which was not tighten up by they mechanic already jad to fork out R6500 nd top they wanted R8500. This ia poor workmanship and lack of competent mechanics from Audi garage in Pinetown.