Charges not authorized, so I don't have an order number to enter and now can't have my question answered.

Can I please just speak to someone about charges to my account?!?! I was trying to update the expiration on my card and it kept not accepting the information. And has now charged me $6.99 five times in a row... But I didn't buy anything. I was prompted to update my expiration date when I was updating apps on my iPad.