AT&T Phone Account

We have 2 business accounts. We cancelled one (which is the one we had set up on line) and now we just have the one business account that hasn't been set up.  How can I set up our remaining account to receive on line billing so we can make payments on time?

I am needing help adding a secondary line for work from home opportunity.

AT&T is apparently bundling and overcharging my mother for phone service.  She has no computer and doesn't pay for TV, but they're now charging her at least $79 per month just for basic phone service.  Nor will they respond to my requests for information.  She is elderly and disabled and living sole

Service Unavailable The server is temporarily unable to service your request. Please try again later. Reference #6.e3f3717.1676027590.10d2bba0 This is what I get every time I try to access to my account. It's frustrating and the help chat isn't working.