There seems to be an assumption by some in this thread that confronting the shop with facts and asking for reimbursement will end the relationship with the shop, so the OP will have to travel much farther for service. I doubt it. You can do it more politely than I implied in my post, but ask yourself what you would do if a customer came to you with clear evidence that you had acted improperly because of a misunderstanding. I am old enough to have been the customer in a number of such situations, and in most of them, the owners were apologetic and quick to make amends. In the cases where they weren't, I was happy to take my business elsewhere, and in the most prominent cases, the company went out of business before long, showing how far such an attitude will take you. In a case two years ago, when the owner found out, he took care of my concerns personally, and all the employees involved in the case were fired.