Hi. Sorry you're having to go through this.

First, let me say, I loved Dr. Bombay.

There are a couple of things I would suggest:

Write a letter to your state board of medicine, making sure to mention that the staff also had issues with him.

If the doctor is under contract with the hospital, you should also make a complaint to the hospital president, board of directors, whatever. Same thing if he's in a group practice.

Of course, it's possible he's got an overzealous and/or incompetent billing person and didn't know it, but I think that falls into Dr. Bombay territory.

Good luck!