Have you tried replying to the e-mail itself? As long as it's not a
no-reply@.... e-mail, it should get through.
If the link isn't working for you, you're not able to log in to open a ticket (which would be my first recommendation), and the e-mail doesn't work, I would recommend submitting an e-mail via this link:
This is generally for sales only -- so I'd only use it once you've tried replying to the e-mail first, though since this is a user-to-user support forum and as users, we don't have a way to access, or even verify your account, it'd probably be the best option.
Make sure you use the e-mail associated with your account and include any relevant information.