Did you keep the old estatements showing that everything was in order? You need to get something in writing to them as soon as possible and payback everything you possibly can. Ask to set up payments for the rest or go to the bank and borrow the amount. Since they are not pressing charges, you are not going to jail. If they do decide to press charges ager, those old statements will be a very important part of your case. You will need a lawyer if they decide to press charges. You can't be put in jail for debts, they would have to prove that you somehow know the money wasn't yours and that you stole it.