I knew it was too good to be true. AT&T's not an upstanding company where they'd live up to their mistakes and honor the orders like that.
Well, we already know AT&T. They don't have to care, they're the phone company. See Figure 1.
To be fair though, their page did specify for two year commitment orders, and anyone ordering month-to-month knew it was a mistake (if they had two functioning brain cells). So I can't really blame AT&T for cancelling M2M orders despite my disliking them as a company.