I hlped someone to finance a car. They got behind on payments and wont give the car back. The dealer has all the information, I cancelled the insurance and registration and done what I could to help the dealer. He calls all the time, threatening me, lied about putting a warrant out on me, which the police said he cant do. The last time I went ot the office he wouldnt let me leave unless I gave him my license and debit card. He never returned my debit card and I had to get a new one.What can I do?