Well turns out things got even worse. The dental office says I didn't give enough notice, 24 hours, though I called the day before. Which is fine, I should have called even earlier. But I still think $350 is an outrageous fee, especially when they have been holding on to $20 of my money!
Last year I had a filling done and was told to pay my portion of the payment as I left. I did this, but it turns out my insurance company overpaid and there was a balance of $20! I was never told this, nor was the insurance company informed that there was a balance in our favor (whose it is, not sure, but I think it's mine).
So I asked why they didn't refund me the money? The receptionist said because they were "holding" on to it until I came in for more dental work. I said what if I didn't come back? She said "Oh well, it's your responsibility to ask for the money back." Yeah right.
If this isn't shady dental practices I don't know what is. I called my dental insurance and was informed that I need to send in a letter informing them on paper what happened so they can investigate the dentist for insurance fraud. I also called the licensing board and was told to file a complaint about the $20 because they legally should not be holding clients money. What do you think the dental office is doing with all these overpayments by clients?
Also the dental office told me there was a sign, not BLATENT, but up somewhere in the office. They said that according to state law, they did not have to get me to sign a form or get me to even see the form and they can charge what they want. I'll be calling another dental office to confirm if this really is state law.
But for now I'm waiting for all my records to examine my previous bills, see their cancellation policy, etc. I think they are real jerks.