Has anyone else encountered a credit card problem with Blizzard recently?

I set 5 of my characters moving server last night... Went to confirm the payments and the final (5th) one was refused. I tried several times and each time it was refused and said try again in 24 hours.

So I tried again tonight and it's still being confused however having phoned my credit card supplier I've been informed the payment hasn't got to them and the merchant must be blocking it their end. I don't have the facility to telephone Blizzard due to their opening hours colliding with mine and waiting weeks for an email response is going to be upsetting to say the least.

So I guess the question is, is there a block in place on a "single" credit card for a large amount of transactions these days with blizzard?