I think that the store cannot use the threat of calling the police to settle a civil matter on their end. You may have a civil case against them. Its like blackmail .. check your state's case law. And if so, it would probably destroy any criminal case against you as well. I know in my state that if you say "pay up" or I'll call the cops, it will end up that the threatenor (word?) would be guilty of a felony.