Help Active notifications...NO " clear" button


My phone's notification tone went off abou 6 times in a couple minutes due to texts and apparently updates. I pulled down the tab to look at the notifications and I can see them listed, but there is no "clear" button. To the left of where the clear button should be, it says AT&T and that's all. I read a few other threads trying to figure this out, and they all say it only shows up when you have current notifications...I keep getting new notifications and the clear button is still gone.

Thanks. Rae