" Your account is unable to make this type of purchase on xbox.com. Please complete this...

I have a gold subscription and went to purchase star wars battlefront 2 with the free gold deal but was prompted with this message......I was told by support to add a credit card as confirmation but I still get the message......anyone got any ideas?? (BTW
the support told me to just buy the game on a 360 that i don't have and will not waste money on)

:)