DRI Arena payment
The CS Team will assist you. Be aware, due to high volume, response are running a bit slower than usual.
You sure you made no purchases from ArenaNet? No Gems, or other items though the Gem Store of the Shop page?
You can purchase Gem Cards at your local retailer, but that would not prevent your account from being hacked, or your credit card details stolen. Account security tips can be found in the Knowledge Base or Stickies above.
Good luck.
(edited by Inculpatus cedo.9234)