Poor Service from Renault Hatfield and Customer Service

Absolutely poor service from Renault Hatfield. Third time I took my car to Renault Hatfield and only received good service once from them. My car's radio stopped working and I had to take my car back three times for it to be fixed under warranty (first time they tried to fix it and the radio then died completely, second time they replaced the radio and only to receive the car back with a crack on the radio screen). Recently I took my car for a service and I was told that my service would be approximately R3500. I then receive a call that the service is R4500 with stuff I did not request or was required. Furthermore, I was told that my belts are due for a replacement. I then requested a quote to have the belts replaced then on the quote it says that a cam belt should be replaced. Funny enough my car does not have a cam belt but a timing chain!!! Usually the customer is followed up with a survey. That did not happen. I then request customer service to contact me, that also did not happen. Its been 3 weeks since my car has been serviced and 2 weeks since I requested customer service to contact me. Extremely and unacceptable customer service!!!