What do I do if I have been overcharged at a dealership?

Don't pay. Make them sue you. They must prove that the services were necessary and that the charges were reasonable.

Take the invoice and the car to another shop and see if they will give you an opinion. If you have been overcharged, take them to small claims court.

1) Complain to the dealership, hope they agree and that they adjust your bill, 2) Pay the bill even though you think it is too high, 3) pay the bill under protest and let them know in writing you disagree and are paying the bill only so that you can get possession of your vehicle and sue in Small Claims Court for the difference in what you pay and what the reasonable charge would be, 4) Refuse to pay the bill , and sue for a declaratory judgment asking the court to determine what the proper charge should be. If you choose 3, expect them to keep your vehicle until the case is resolved. Depending on the amount of the overcharge, #2 (after trying #1) is probably the best option.

Put your complaint in writing to the department supervisor/manager or even the GM of the dealership. If you can get support from AAA, they should be willing to revise the charge.

Go first to the dealerships owner, if no satisfaction, a lawyer.

Prepare a written summary and timeline documenting the circumstances of the need for service at dealership, service documents signed, services provided, and protests for the overcharge. Make an appointment with the service manager to discuss your complaint, and have your summary and timeline handy to help you stay on-track.