Error 202.

So I've been trying to upgrade Vanilla to TBC (and eventually WotLK and then to Cata), but when I go to make the digital purchase, it doesn't process and and gives me an error 202 message (which is also broken; not providing the link it addresses in the message).

Browser data and cookies are cleared. Still, the same message.

I'd like a digital purchase over buying a retail copy. It's just how I roll.

Thanks in advance for any constructive advice and help.

Edit to add: I read something online about checking your IP address against the credit card billing information when you initialize the authorization. I maintain two residences, in two different, neighboring, states. All of my finances are consolidated to my Texas residence, but I am currently in my New Orleans residence for the foreseeable future.

Anyway, any help on this would be appreciated. Worse come to worse, I'll suffer through the nightmare of contacting Billing.