Ask HN: I just lost a few databases. What to do

I recently cancelled my MediaTemple account, because we decided to host the sites ourselves. We migrated the sites, assets and databases..

But we forgot about one client. A sleeping one. I tried to logon the MediaTemple panel, to retrieve it, but sadly, the account has been cancelled, and thus I cannot login, nor can I create a new ticket.

Any tips, hints or ideas on how to handle this rather critical problem :(