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.