Not Fixing Check Engine Light

First put the wrong part on my car and couldn't find the second problem the car was having. Charged an exorbinant amount for both the part and the repair. Since the check engine was still on after leaving his garage, had to take the car to the dealer, where they did all the proper repairs using the proper parts and charged much less. Went back to Tony to show him the bad part and details of the repair. It was like pulling teeth to get him to refund me the cost of the part, and he absolutely refused to refund me any portion whatsoever of the labor, even though his repairs were completely useless. DO NOT TAKE YOUR VEHICLE HERE!!