Whether or not you owe a debt, you have the right to be treated respectfully by debt collectors. You also have the right to honest information about a debt, and honest information about your legal rights. So if a debt collector is threatening you with actions that are illegal (such as arrest), calling you at work when they know you can’t take calls there, demanding an amount of money that you don’t owe, or refusing to provide information to prove that they own your debt after you’ve asked for it, YOU might be able to sue the debt collector and force them to pay up.