ERROR (11000) Crysta

I can not buy Crysta because I get this error:

ERROR (11000)

A technical issue has occurred.
Try accessing the site again. If the issue still has not been resolved, please contact the Square Enix Support Center.

Fix this! I want to pay my subscription, I have only 3 days ;_;.

I had that once on my other account that I managed to get working, Using paypal instead of my CC seemed to have worked.