Check with your credit card company and see if they can help. What kind of typo errors were on the receipt, anything dealing with the cost of service?

Not only would I write a letter to the "head honcho" of the company, I would also take a copy of it to the dealership manager explaining what had happened and telling them that the letter will be sent to the "head honcho" and to the dealerships supplier (GM, Ford, Chrysler)... I would not be surprised if he/she tries to remedy the problem themselves.

If they do say that, then get a firm date of resolution by saying that the letters will be forwarded within 5 buisness days if nothing has been accomplished.
P.S. Keep your letter short and to the point

Van <img src="/forums/images/graemlins/patriot.gif" alt="" />