This is a Law firm that has Sued multiple people in any state that will allow it. They want you to miss your count date so they can get judgement aginst you.....
They are in no way associated with a court. In fact, record the calls. They are BREAKING THE LAW. Don't let them scare you. If they want to sue you, let them sue. Show up to court and defend yourself, make them prove the debt, and the matter will be resolved in your favor.