****ty Merc service at bedfordview

lI took my SLK 350 for a service, Mandy was the service consultant that assisted me. When i collected the vehicle i was told they had no stock on air filters and would contact me to bring the vehicle back to have the air filter fitted. The i requested that the invoice be corrected and needs to be made out to my company which she acknowledged and said she would e-mail the invoice the following day. It has been 3 or 4 weeks now and still i have no invoice. I spoke to her a week ago after leaving messages for her to call me back which she never did until i spoke to the workshop manager. this was around a week or so ago, again she has not come back to me. I also brought up the fact that a week after the service i opened the hood and saw the front section of the engine cover is not sitting right. I then noticed that the dumm mechanic that worked on the vehicle did not clip it back properly. I clipped in the one side and when i tried to clip in the other side i noticed that it is not clipping in, when i removed the cover i noticed the clip has been broken off. I did mention this to the workshop manager as well and he was going to look in to the matter and come back to me. again i`m still waiting. It seems Merc Bedfordview does not give a **** about cutormercare or their clients once they have your money in their bank. so what is the use of taking a vehicle to a dealership if you get treated like just another asshole by even the management.