I can't belive you didn't beat him with the bumper! $12,000? This guy must have more balls than a pool table. He is a legitimate business man? I would waste no time in telling everyone who he is.
Including here.
If you really gave him that kind of money and that is what you recived in return you do have options. He is supposed to give you an itemized statement of all the work he performed and how much each costs including labor. Collision and auto repair is closley regulated by the state nowdays.
If he didn't do so, take yor cancelled checks and photos of the car to the state attorney general's office. This ******* should not be allowed to operate a business.
If that dosen't work call my cousin "Vito the torch". He won't charge you twelve grand but he will keep his end of the contract.