日常生活英语-Calling Credit Card Company(1)

A: I'm calling today about a bill that I never received.
B: Can you tell me which credit card it was for?
A: It was for my Master Card.
B: You should've gotten that bill two weeks ago.
A: I haven't got it in the mail yet.
B: The computer is showing that all bills have been mailed.
A: What am I supposed to do about my bill then?
B: Maybe you should call your post office.
A: But if it's their mistake, can I get an extension on my bill payment?
B: Yes, but you will need to send us proof of their mistake.
A: Okay, thank you very much for your help.
B: No problem. Enjoy the rest of your day.