Product: Debt collection

I went to the emergency at XXXX XXXX in XXXX XXXX. The doctor saw me for less than one minute, gave me some medicine, and sent me home. 
Then the doctor billed {$560.00} to my health insurance on XX/XX/XXXX. The insurance paid the allowance {$170.00} on XXXX and notify me about their claim and also that I dont have any responsible to pay the difference. But the XXXX XXXX XXXX XXXX started to bill the difference {$390.00} on XXXX with shown my patient account, date of service, doctor name and shown insurance paid {$170.00}. 
I send a letter and notify them that I am not responsible for paying the difference amount and stop the billing. But they keep billing so I called my insurance. The agent from insurance called the XXXX XXXX XXXX group. We even had three way phone call and the insurance agent explain to her the allowance {$170.00} already paid and the patient dont have any responsible for the difference. But they keep billed me every month. 
Eventually, I sent the difference of {$390.00} to XXXX XXXX XXXX XXXX on XX/XX/XXXX and they deposited it on XX/XX/XXXX. I sent it because I appreciated the doctors and first responders that were on the line during the pandemic since those were dangerous times. Then, they changed the billing amount to {$170.00} on XX/XX/XXXX and kept billing me so that I am responsible for the entirety of {$560.00} even though my insurance has paid for {$170.00} and I have paid for the {$390.00}. The XXXX XXXX XXXX XXXX has billed me monthly from XX/XX/XXXX to XX/XX/XXXX even though the entire balance has been paid for already. I have lost my respect for this organization because I feel that they are mistreating patients, try to bill the old patient incorrect amount and try to ripe off the patient went to Emergency service. I thinking that might be the fraud and I dont reply to them. They keep billed monthly until XXXX. 
I received a letter from CMRE Financial Service Inc, the debt is $ XXXX XXXX {$170.00}. I wrote the first letter dated XXXX to CMRE Financial Service to indicate the insurance already paid for {$170.00}. And CMRE Financial Service Inc responsible for contacting XXXX XXXX XXXX to correct the mistake and I will charge {$10.00} for each document if they request plus {$10.00} for each letter I reply to them. I dont have any responsible for their incorrect billing and their mistakes. I have lost the respect and appreciation to the XXXX XXXX XXXX so CMRE Financial Service and XXXX XXXX XXXX XXXX need to refund back to me {$390.00}. I am charging {$10.00} for each time I send a document and $ XXXX of document if CMRE Financial Service request since they are using my resources and my time to correct their mistake. They keep calling to my home phone every day so I send out the second letter to CMRE Financial Service on XXXX. I block the number. 
I believe that CMRE Financial Service Inc. and XXXX XXXX XXXX XXXX are colluding together to try and charge more from patients, patients need the emergency service, particularly the vulnerable and elderly patients. They are committing medical billing fraud which they might have done to other patients as well. I am requesting that an investigation be held to inspect their operations and requesting that their licenses, permits, certificates, registrations be revoked. Thats the medical billing fraud to my case obviously.

Besides, I request law enforcement emphasizes to control all the debt collectors need to investigate and understand the billing before they send out the letter for collection. Otherwise consumers waste their resources to response their mistake and their unprofessional task. Thats not unfair for consumers.