Great Expressions Dental Centers review: unethical behavior

I tried unsuccessfully to drop a complaint on their "contact us" link, it kept returning with an error.
I am not even motivated to write about my horrible experience because upon further search on the internet, I happened upon their profile on Better Business Bureau website :
"Pattern of Complaint
In May 2019, BBB investigated Great Expressions Dental Centers' business practices. This investigation was prompted by a pattern of complaints, surrounding billing and customer service issues. BBB attempted to reach out to the company via certified mail, telephone and email. After multiple requests to the business for further information on noted issues, BBB received response acknowledging receipt of our concerns, but the business failed to respond to questions to potentially eliminate underlying issues with consumers. This business has also indicated that it will not work to resolve customer disputes through BBB. Consumers with outstanding concerns are still encouraged to file a complaint for BBB records, but may also wish to contact legal counsel and/or MI Office of the Attorney General Consumer Protection Division at: www.gov/ag."

Not surprisingly they were rated F!
https://www.bbb.org/us/mi/southfield/profile/dentist/great-expressions-dental-centers-0332-46000435/details#all-alerts