Business ProfileforER Coit LLC

I was billed by **************** LLC for the amount of $624.25 on 10/23/23 for an Er visit in October 17, 2021. I thought it was unusual to receive a bill this late so I contacted the billing company via email to ask about the delay. I was told they were doing an audit of unpaid pills and i owed a balance of a deductible and copay after insurance was billed and if I wanted to avoid going to collections, I needed to pay the balance in full. I asked if I could pay in installments and they said yes. I paid my first installment of $208 on November 30, 2023. I then received a ******************* 8th for $970.12, which is over $300 more than the original bill. This made me question the validity of this bill and I believe its part of a scam. I received a call the same day from a ********** phone number with a robo call voicemail saying they needed my address for a physical bill. I called them back and left a voicemail asking why I was being charged more than the original bill. I tried calling the phone number from the text about the bill and there was no voicemail greeting which seemed odd. I looked up the business address and ER near lcc me is not listed at the business address. I looked up the phone number and found it was associated with this same report on BBB. I would like an investigation into the validity of this business and a refund. If it is valid I would like an explanation of charges.