The subscription errors aren't just a sole problem of square's, I had the same issue when I was playing wow. Perfectly valid MasterCard debit card that I use for most everything including this game. Ended up having to use Paypal to pay Blizzard.

As for trying to get customers to split, sometimes you really have to wonder. I mean between all the issues outside the game itself and all the cheating that looks to never be resolved, Square surely dances to the beat of their own drum regardless of the fact that they are alienating large numbers of their fans.