Extremely poor customer service, will never take my vehicle there again

My Renault Scenic developed a clanking noise when taking the foot off the accelerator pedal and then accelerating again. To find out the reason I took the vehicle to Tableview Multifranchise on 4 April 2018. I arrived at 07:30 and asked if a mechanic could test the car but was told this could only be done after 09:00 because of traffic. I explained that the car could be tested on their access road as the noise was audible immediately. Reluctantly the service manager got into the car, rocked it forwards and backwards a few times then diagnosed that the noise came from the gearbox mounting and required a part from JHB which would cost R1353.79 plus R700 labour (plus VAT), which I paid. When the part eventually arrived 2 weeks later and was fitted I was told that this would only solve half the problem as there was another part missing which would cost an additional R752.39 (plus VAT) and would be sent overnight. A week later the part arrived, was fitted and I looked forward to a noiseless vehicle. Unfortunately after a few meters the same noise was there again. I complained to the workshop manager and after consulting with the mechanic I was informed that the noise was coming from a faulty driveshaft which would be cheaper to fix by taking it to a driveshaft specialist. I find it ridiculous that I wasted over R3000 on a wrong and lazy diagnosis and that they did not have the decency to tell me on collection of the car that the noise was still there. The matter was reported to the JHB Head office who assured me they would look into it and come back to me. I am still waiting…