I agree, but have a witness (not family) for when you sue them. It will come to this because until then it is a he said-she said affair. Witness must not be family. Make sure it is a mark easily identified that is not easily deciphered by some mech jock. Remember, they will have a mechanics lein on your car for payment so you need to have all ducks in a row. If you get car back and see the same module, then it is easier (notice I did not say easy?).