Lack of Professionalism - Disappointed.

I bought a vehicle on condition that the hood lining would be replaced. The Sales Rep that assisted me made a note on the OTP document assuring me that it would be done. He requested that I should get a quote from VW and send it to him. After approximately a week or two and a number of calls a driver was sent to collect the car from me. I was left without a car for a few days. I was then told that the car is ready and that I must make means to collect the vehicle. When I arrived at the place I was disgusted at the quality of the work done. Not only was it untidy but the color was incorrect, a cheaper material was used and the lights which were working under the sun visor are no longer working. I have contacted the Sales Rep on numerous occasions for an update but have found no joy. However he response is " I will speak to my Manger". It been almost 2 months and nothing has been done.