Lets see, can I have an O, please, darn Hangman!!!!

Your manager is correct. It may be possible the patient is playing a game with you by signing up with your provider as their PCP and then changed PCPs without telling you.

Your contract with A _ _ _ A, no doubt allows them to automatically recoup. The way to prevent this in the future is to redo the contract.

The patient is already flipping you the bird by not communicating with you and they could care less about you. They got what they wanted. Bill the patient for what is owed, inform them if payment is not received in 30 days, their account will go to collections and if they don't pay, send them.