If you post your Steam ID (or just your steam profile) here, then I can look into what account it is connected to. You will then need to prove that this is your Steam account to a staff member on Teamspeak (most likely by logging into the game and speaking to them ingame). After this is done then I can remove it from that account and you can sign up with it.
If you catch
@TomTheDoge that would be best since he has dealt with this before.