I sold a car to a friend of a friend ( I know, stupid) She was supposed to pay $2500. After we switched the titles over she said she had to go to the bank for money, then only gave me $900. She said she told her friend that was the agreement ($900 now and then monthly payments). She never talked to me about it. It was miscommunication and my fault. I’ve never sold a car before. We made up a promissory note with payments and she missed the first payment. Now she moved to another city and told her friend she wasn’t going to pay me the rest. There’s another big mistake on my part. When we switched the titles and did the bill of sale we did it with $900 as the sale price. But I do have the promissory note. Is there anything I can do?