Century City Mercedes Benz

I purchased a C63 AMG from the above. The vehicle had rattles which I reported & they informed me to bring the vehicle back. I bought the vehicle back & the repair to 1 of the rattles was fixed. They however needed a longer period of time to complete the job on the other repair. It has taken them 4 different occasions to \fix"the repair. To this day there is still a rattle. Upon the 1 drop off myself & about 20 other people waited over 1.5 hrs for their shuttle service to drop us off. I ended up catching a taxi home. I tried to bring this to the attention of dealer principle who never got back to me for over a week. I had to call back. This was not the 1st time I had spoken to the dealer principle. Upon purchasing the vehicle I went in there 3 different times before the sales department bothered to call me back. We then had a meeting regarding the above with the brand manager I believe and I asked him how he would feel if he was treated like this? He felt I had been treated no different to any other client and his opinion I had been treated fairly. Oh"