After you drive away with your new vehicle, things don't always go as planned. If something is wrong with your vehicle, or you find fault with the deal, there are ways to set things right. If you think the problem should be covered by a warranty or service contract , go directly to the dealership.
Some dealerships also have customer relations managers whose job is to handle such complaints.
If they can't help, go over their heads to the dealership's general manager. If the warranty comes from the maker and the dealer is of no help, contact that manufacturer. Auto manufacturers are easily found on the Internet by using the make as a keyword in a search engine. Some contracts in fact require arbitration to solve all warranty or service contract disputes. Check your lease or sales documents before asking for help the first time.