Toe,
I would take Caps advice and simply go see the GM or the Owner and talk it out civilly. If that does not work, take the truck to a GM shop and get an estimate to fix it. Then send a simple demand letter (you can get standard forms online) should be sent to the shop asking them to fix or compensate you for the problem they created. If at that point, they do not take it seriously, then consider an attorney. Just be sure to remember that while it might be $1500 issue, cases like this can cost upwards of $5000.00 in legal fees and you may or may not recoup them. Also, while a win in court is just fine, you still have to collect. That's the problem.
I educated myself on the process over the past few months, and realized that in some cases, you are just spending good money to go after bad. In the end, you might end up with a piece of paper that does not end up compensating you for the initial loss, let alone the additional costs of a suit.