I'm strongly fighting the urge to call you Whinemaster, but only because it would probably be against the social guidelines.
I don't understand why do you feel you have been "sucked out your money" in an unfair way. I mean, it's not like they have promised you a things they didn't gave you afterward. You bought the subs thinking you would have nothing more than the good "50% bonus time" deal, and you have willfully paid for it.
The fact that there's bonus for the anniversary is not relevant to the problem.
Sure, you can be disappointed for missing a bunch of AA. That's a fair point I guess. But this has very little to do with the money you spent on the subs. You have been given exactly what it was stated and you knew what you were buying at the time. It's a bonus, for Crom's sake, it's not like they suddenly got rid of half of the game & half of the quest one week after the offer. Now That's a scenario where you could complain you have been ripped of your money