Aspen Dental review: Surprise billing, fraud in billing, taking advantage of the elderly

I had severe tooth decay between my teeth that the only solution was to remove all my teeth (20) and replace them with dentures.
On 27 Jan 2025 I visited Aspen Dental Yulee, Fl for a x-ray and dental exam. The dentist told me all my teeth had to be removed and agreed on dentures. After meeting with the dentist I was told to see the business manager for the cost. The dental plan was over $12,000. II told the business manager that I could not afford that amount. The dental plan had no value for discount coupon, despite there website advertisement stating 25% off dentures. I asked if the had senior citizen discount or veteran discount, and the answer was no. My insurance would pay $2500 and she applied an insurance discount of over $6000 leaving a balance over $3500. I still said that I am on a fixed income and did not have the money. She said do not worry she had applied for Credit Card and they will loan the me $3000 at $88 per month for 3 years. I had been in a lot of pain in the last month and this looked like the best deal. I paid the balance with my debit card and my dental plan had a balance of zero. Two day later I had my teeth extracted and was fitted with temporary dentures. I went home and several hours later the Novocain wore off the dentures rubbed against my gum and cause pain that I had to take the dentures. My gums were swollen, still bleeding and had either bone or tooth protruding through the gum in several location. I waited a week to go back for the free adjustment but was told that I owed an additional $3178 and I could not get the adjustments unless the balance was paid in full. I did not have the money for this surprise bill and left the office. I have tried several times to talk with the business manager by phone and in person but she has not been available, returned my phone calls not set an appointment to discuss the outstanding balance. In March I received a Summary of Activity stating I owed $3178 and this was the final notice.
I did not know what to do. How can Aspen Dental charge me when I have a dental plan that showed a zero balance. The bill I received did not match the amounts as listed in the dental plan.
Upon a detail inspector of the dental plan I was charged $800 each for top and lower dentures to upgrade from classic to signature dentures. This was not explained in detail when the dental plan was presented.
I found out later that the basic dentures upper and lower each cost at Aspen Dental was $452 but I was quoted the basic dentures upper and lower each were $1749.
Classic dentures on Aspen Dental website was being offered at a 25% discount and so was the signature dentures. But no such discount included my dental plan.

Also I was billed for a tooth extraction for tooth that was a post and crown. I am sure the cost to remove the crown is not the same as a tooth extraction.
I realize now that I had been duped into signing a dental plan that had a zero balance only to charge me an additional $3,178 after all my teeth had been extracted. I think this is a unfair business practice, is illegal.
As of today I cannot wear the dentures, I still have round white bumps on my gums with either bone or tooth protruding. I used all my insurance dental insurance for 2025 and have to wait until next year to find a dentist to determine the damage that was done to my gums and to be fitted with new pair of dentures.