Defrauded in car loan, now I have to pay?

Long story short, my car was repo, and because I allegedly tampered with GPS, dealer wouldn't reinstate loan, told me to pay of whole thing, which I couldn't. Car went to auction, and sale went towards the bill, which I wasn't going to pay because I don't have the car anymore. Dealer sued, and judge... show more Long story short, my car was repo, and because I allegedly tampered with GPS, dealer wouldn't reinstate loan, told me to pay of whole thing, which I couldn't. Car went to auction, and sale went towards the bill, which I wasn't going to pay because I don't have the car anymore. Dealer sued, and judge or somebody gave them a judgement, and that I have to set up a payment plan or they garnish my wages? I don't have the car any more! I thought that by them taking the car we were even, I didn't even get my downpayment back! Also they say I owe way more than what the car sold at auction for, because even though the car was running, they ran the car as not running just because they had no key. They blame me for not giving them the key. They sent a notice asking for the key, but they took my car and gave me nothing, so I said I ain't giving them nothing either, so I didn't give them the key. They could of gotten a key and sold it as running, and sold it for more. This is fraud and misrepresentation. How do I sue?
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