Has anyone tried to purchase Microsoft Points through the Xbox website recently?

Last week I was able to purchase points, but for some reason when I try this week, the system is unable to process the request. The following message appears:

This action cannot be performed at this time. Please try again later. For more information, go to http://www.xbox.com/support.
Could it be a system error? No, I cannot purchase points using my Credit Card, because for some odd reason I was "blacklisted" from using my current card, even though it's Microsoft's fault (and they acknowledge this, but won't help me resolve it).

Customer supports knows NOTHING either...no surprises there.

Any ideas?

And yes, the Paypal account is still valid.