Your Internet access has been temporarily suspended with att&t Real ?

Sure sounds like spoof notifications.  They can tell you're AT&T from your IP address, the rest is just click bait to get you to provide personal information and/or allow them to install malware on your PC, or both.

It could also be malware already installed on your PC.

This is not malware. This is happening on all computers at my house since the last month or so. 

Can you post a screenshot?  (It is at least possible that all your computers are infected with malware, but you're probably correct.)

We'll do our best to figure out what's causing the error message, @Neekowafers.

Be sure to send the screenshot @JefferMC suggested and we'll take a closer look.

We'll be awaiting your response.

Aminah, AT&T Community Specialist

Thank you all,  here is the screenshot:

Thank you problem solved it was the bill...thought we had auto-pay set up at our new location, but not the case.