Still getting bills on cancelled account

your customer service is horrible as this has been done several times and still getting bills.

There are three ways to cancel service:

1) Port the number to a new provider (if you want to keep the phone number)

2) Speak to a representative and tell them to cancel your account (if you don't want to keep the phone number)

3) Stop paying the bill for a long enough time that AT&T cancels your account and sends you to collection (not ideal, to say the least)

I'm a guessing "over the phone" means you did procedure #2? When was that? Service ends at the end of a billing cycle, so getting a two bill after the date you called isn't unusual. What are the dates on the bills you've received?

it is weird