They know it happened there are enough people calling and system checks that they know an issue took place. I would say it's fairly obvious at this point that if you had a 24 month promotion and you hit your 13th month you didn't get that credit. Of course people love to knee jerk saying it was removed when it's just a billing system fluke that will be fixed next month. I can't think of any credits before that were 24 months in length. The longest prior were 12 months so it's probably a line of code somewhere that they didn't anticipate because it was never an issue before.