Business ProfileforCollege of Dentistry

I went in to the *** College of Dentistry for an oral surgery consultation (Sept 2023) which was supposed to only have a $20-30 co-pay. I was very clear that I didn't want to incur any additional out of pocket expense. They said they needed to do an x-ray, but that it was fully covered by insurance. No followup was required after the oral surgury consult because it was only a precaution (suggested by a dentist there) and it turned out that everything was fine, so I checked out and left with no indication of other fees. Then, when I went back months later to see my regular dentist, they told me that I have a $340 balance for that x-ray, although I never received any bill or any indication when I left that I would be billed. I went in to try to clear this up but they said they couldn't do anything and would have a supervisor call me. I asked for a copy of the receipt (i agreed to pay the the $24 consult co-pay) and list of charges, and what they gave me still doesn't have any itemized indication of what they are billing me for, just a $340 balance. I am still waiting for that call from the supervisor, but I am not optimistic. I tried calling them but the mailbox is full. This is the worst customer service I have ever experienced and wish to let others know about their predatory business practices.