Bad service and unprossionalism

I bought my car at Mercedes-Benz centurion and fountains. It has been over 4 months since I bought my car and upto now I do not have my spare key or service book. Every time both dealerships give me the run around. I went for 3 days without a car after I misplaced my keys. Can they please give me my spare key and book they have inconvinienced me enough. When you are buying a car they treat you like royalty now that I have the car they treat me like trash.