There are specific date windows within which you must enroll in order to get the discount (currently before March 24th). The first time I enrolled in auto refill, I didn't get the discount either, then I canceled and re-enrolled within one of the date windows and am now getting the discount.
It actually saves you about $1.00/month over paying sales tax on the refill card at the store.
Personally, I think the whole date windows thing is a crock to get around giving you the discount. If your going to offer the discount, just offer it all the time and stop playing games.
Reason of review: Not as described.
Preferred solution: Deliver product or service ordered.
I liked: Unlimited plan, Price.
I didn't like: Misleading diiscount promises.