Weird. My txt said the following:
"Hi, it's AT&T. As early as Oct. 2nd, the AutoPay and Paperless discount for customers paying by credit card will decrease from $10 to $5 per line. If you prefer to use your credit card, no action is required to receive a $5 discount."
Sounds like your offer is different. One quick tip if you are looking for other ways to save on AT&T. If you sign up for AARP you can get an additional $10 off of the top plan in addition to the paperless discount on AT&T.
Anytime a website wants to store more than 5MB of data safari asks for your permission first. This page talks about a bug in webkit where it miscalculates how much storage is being requested:
https://bugs.webkit.org/show_bug.cgi?id=202137
Some people say that deleting all the storage for the site in question in safari settings -> privacy -> manage website data will fix it. Be prepared to log in again after deleting the data.