Bright Now! Dental review: Elderly abuse

I am writing today as I was as I was taken advantage of, because of my age by Bright Now! Dental in Lake Elsinore, CA.
I had dental work done last year that was completed in Sep 2020. Before anything was done, I gave Bright Now! Dental in Lake Elsinore all my Insurance Information so they could check out what was covered and all the terms necessary to complete any work needed.
They called me back about 1 week later advising me what could be performed during that calendar year 2020.
It was decided to do 2 deep cleanings, 1 crown and extract 1 tooth.
All the planned work was completed and I paid my portion bringing the total I owed to zero.
Now all of sudden, over 6 months later I am receiving a bill for $ 161.00. They tell me it is because I did not wait 7 days between cleanings and my insurance is not covering that.
I totally disagree with the additional monies owed because Bright Now! Dental in Lake Elsinore, who is supposed to be the expert in these matters did not follow the guidelines and rushed to complete the cleanings in 2 days instead of spreading them out. They are trying to take advantage of me because of my age by bullying me and when I said I would complain, they said that is my right.
I had other work planned for this year and so did my wife and other family members but now with this incident, we can not trust them anymore and will go to another dentist who does not take advantage of their customers.
They made the mistake and will not own up to it.

Joe T - Lake Elsinore