Blizzard Store Error

I was recently trying to purchase game time for my boyfriend with my MasterCard, but I get an error telling me "We are unable to process your transaction at this time." among other similar messages. I heard that Blizzard has recently been having problems with the online store, so maybe this is just another case.

In any case, I checked the card and all is well. I have not gone over my limit (I'm far from it) and there are no restrictions, I've made sure of it.

I cleared my internet cache and cookies and have tried in both Firefox and IE on two different computers with no resolution. I also tried phoning Blizzard, but could not speak to a representative.

Any suggestions would be great. Thanks.