Business ProfileforAspen Dental

In May of 2021, I went to Aspen Dental to schedule an appointment to receive a full set of dentures. I was given the amount of the procedure(s) and applied for and received a Care Credit card. The amount that was charged to that card was around $2500-$3000 dollars. I went in for the procedure on 6/7/21. I had a problem when I checked in because the receptionist told me that I had to pay approximately $450 dollars more before I would be seen. The issue was resolved and had the procedure done. I was told that Aspen was having issues with my insurance carriers, United Concordia and AFLAC. They told me that they would get it squared away. That was the last that I have heard from Aspen Dental until I received the bill that is attached on 6/11/24 ($1738.83, account #********, full payment requested upon receipt). In the three year time frame I paid off the Care Credit account and the account was closed due to it not being used. I contacted the Aspen Dental billing department and spoke with a young ***** ********* (not exactly sure), and explained the situation. I asked her why it had taken so long for them to send me a bill. I told her that I thought that the account was paid in full. She put me on hold and told me that her "support" staff related that one possible cause is the fact they went through a system upgrade (it took 3 years? ). She informed me that the insurance companies did not pay the difference. I no longer carry them. I stopped coverage a year or so after the procedure. She told me that 3 statements were mailed between 6/14/21 and 9/1/21 for $4763.83. Another statement was sent on 12/5/22 for $2910.23. I received none of the statements and they stated they could not provide me copies of them when I asked. I was told that I could not speak to anyone else about the matter. If insurance had not covered any costs I should have been billed at the time, not three years later. Please explain.