The other commenter said "bill", but you added the S. I got the impression that you could log in to pay your AT&T bill and nothing else. And if the service being billed for is down, maybe it's ok if people don't pay that particular bill right away...
Honestly, that makes sense. Outage reporting service is nice to have. A way to pay your bills is a requirement. They clearly have different SLAs.
The other commenter said "bill", but you added the S. I got the impression that you could log in to pay your AT&T bill and nothing else. And if the service being billed for is down, maybe it's ok if people don't pay that particular bill right away...