听力原文：W: You'll never believe what happened to me today. I got my phone bill for this m

onth, and it's over $100! The worst part is, I didn't make all of the calls. There's a bunch of extra long distance calls.

M: That's unusual. Did you remember to pay your last bill？

W: Yes, I always pay on time. And the only time I make long distance calls is to speak to my sister in America. I'm on the Internet a lot, but that's a flat rate every month.

M: You should call the service provider today and see if they can sort out the problem. They can probably remove those charges from your bill.

What is the woman's problem？

A．She was overcharged.

B．She did not send payment.

C．She did not receive the bill.

D．She paid the wrong amount.