Pathetic service and bad conduct

In January 2015 I was told by Alvin Harrisunker, Service Manager, that the sump gasket on my Modus needs to be replaced. I was given a quote of about R3 100. At that stage I did not have the money so I did not take my car. Then in June I called Alvin and asked him to e-mail me the quote again. He then sent me a quote for R6 235 stating replacment of the Cam/crank seals and sump gasket. My question is how can you quote on a car that you have not even inspected. On Wednesday 12 August 2015 I booked the car in for the replacement of the sump gasket only. The car was there from 7.40AM and only after 13.00PM a woman from the Service Department phoned me to inform me that the cam / crank seals, sump gasket AND cam belt need to be replaced? I was never told that the cam belt must also be replaced! The cherry on the cake was that they did not even have a sump gasket in stock which was the reason the car was there for in the first place! How can they take from 8 in the morning till after 1 to tell me they don't have a part. They wasted a whole day doing ABSOLUTELY NOTHING! I am so furious with their PATHETIC service and ********* conduct. I WILL NEVER TAKE MY CAR TO RENAULT AGAIN! USELESS!!