Problem buying Lindens

I know I havn't spent more than my monthly limit, but whenever I try to confirm my purchase to buy the lindens it gives me this message:

"We are unable to complete your request.
• The system encountered an error while processing your order, please try again. "

My credit card and billing address are all valid, so why can't I complete the order? Its really killing me now, Ive been trying to do this all week.

It's been borked for quite awhile..
I thought it was fixed but I dunno...
lol fixed.. sorry I had to laugh at myself for saying that...

this problem is a bug, you need delete your accounts credits card settings and write all again in your profile and the problem fix