Guild Wars 2

130401-001783
So I’ve been purchasing gems over the past few days because I wanted to get keys, the Quaggan backpack, and the broom. Now when I try to purchase gems again, it says that I need to confirm my identity. Any solutions?
Attachments:

Hello, I want to pre-purchase GW2 with credit/debit card,
but the system says that"The credit card information you entered was invalid. Please try again."
And I’m already calling to the bank to check my credit card.
And I also check the browser and my computer twice.
They seems to not have any problems.
Can you help me to solve this problem as soon as possible?

And I’ll provide some information for you to find the problem with this transaction.