I have been incorrectly charged for a simple annual physical

So a few weeks ago, I went in for a preventative visit. I specifically asked the primary physician to please point out if any questions are not covered under a preventative visit and he was totally aligned. At no point during the visit was anything besides the intent of a preventative visit mentioned.

Come to find out, a few days later, I get a ridiculous charge of $370 because, apparently, I was diagnosed with insomnia, high blood pressure and several other unfamiliar conditions during the visit. I guess anything that you say can be used against you in the health industry, even during a preventative visit.

I told the scam of a billing department that even the doctor agrees that this is a mistake and understanding, and they continue to tell me that this is all based on “doctor’s notes.” I tried to get a review started. The review concluded and they basically came back with the same obtuse response.

I’m not going to pay a single dime. So I’m wondering what’s the best course of action here in fighting the billing department and the ridiculous, incorrect charge?