What can I do about a car repair that was never done?

Question Details: I paid my girlfriend's cousin to fix my car, which should have only taken a weekend. Instead it took several months. After he took the car I was told that something else had broken and that he'd need more money to fix it, which we paid. He informed me later he couldnt fix it. I told him fine but it was taking too long and to just bring it back. More months went by, and I repeatedly told them to bring it back. I had to threaten to report it to the police as a stolen vehicle. When I finally get the car back, I was told while it was there someone cut the gasline. What can I do? I'd like to get money to fix the damages done while in his possession and to get back the money paid for the horn that wasn't fixed. Any advice or should I just let this go?

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