My Doctor Charged Me 5x More.

Hello,

I am in the USA just 2 years..

I have a problem that the doctor I talk to on the phone has charged me $60 for a 10 to 20 minute phone call. I've had about 10 of these calls, everytime they charged my card $60. But the last two phone calls nothing was charged to my card, but I received an invoice in the mail asking me to pay $600 instead of $120.

They never informed me that the price of the phone call with the doctor is $300 instead of $60 or that they would send me an invoice or that there were any other changes.

I'll call them tomorrow. But what if they don't agree with me?