Is it legal to pay a different co-payment for dental treatment than what you were told to pay?

Question Details: I went to my dentist for a special cleaning. I knew there was going to be a very small co payment. The receptionist informed me I had to pay $3. So I paid it and went on to do the procedure. When checking out they told me that I had to pay $95 because my insurance didn't cover it. They showed me a paper I signed saying that I knew this but why didn't they tell me this before I did the procedure? Is that legal? I couldn't afford it and they have done this before to me.

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