I was a patient of XXXX XXXX XXXX for several years and received care on a monthly basis. We had a disagreement about the medications I wanted and they terminated me as a patient. Over the years, each month they would bill XXXX and my medical insurance and receive payment for their services. When they terminated me, somehow they decided to bill me direct. They should have billed XXXX and my medical insurance and they would have received payment. I sent them a letter informing them to bill XXXX and my medical insurance and gave them the appropriate information for this ( see attached ). 
I should n't have to pay them for a mistake they made!