Please contact Support by filing a ticket through the “Ask a Question” tab on that linked page. They will be able to assist you. For tips on what information to provide in a ticket — mostly intended for security reasons to establish that you own the account — please read this post and provide as many suggested details as possible to expedite the ticket.
Our Support Team can help you with many issues. You can expedite the help that you receive by providing certain details when you contact the team, such as the following:
Your GW2 Username
Your GW2 Display Name
Your serial code
A character name, if any
A detailed description of the issue that you’re experiencing