Notch another one up for Blizzards customer care!!
In their wisdom they have frozen my account as the last payment I made was from my new Australian bank account, I can understand the concern and that this is some kind of security measure, however it would have been nice to be contacted by email to determine if this is a legitimate payment rather than just stopping my account.... Anyhoo hopefully they can rectify the situation quickly as it's saturday morning here and was wanting a wee game this afternoon, although its taken 2/3 days for billing support to get back to my queries in the past. I guess when you have 9,000,000 subscribers your responses tend to get a little tardy :-P