So I had my 1993 Sentra SE-R up for sale. After a couple of non-starts a guy was serious about it but couldn’t afford it all at once so he gave me $300, we exhanged handwritten receipts, and I held onto the car, title, the lot until he would get the rest of the money by “next week”. He then lost his job and worked on selling some wheels to get me the rest of the money, then dropped off the face of the earth. I have the car, and the title, and it’s costing me insurance each month to have the stupid thing around. Thing is he has a piece of paper signed by me showing he put $300 towards it. My constant attempts to contact him via Facebook Messenger have been unresponded and unread. The hell do I do?