Hi Hellbat,
Unfortunately according to the Elysium Terms of Use, under the "Account Information" section, it states "The account owner is responsible for the security of the account and that it's sufficiently protected. Note that Elysium staff does not recover hacked accounts."
Hopefully you are able to recover your account through Two-Factor Authentication if that was previously set up.
If not, admins can not recover your hacked account precisely because it typically comes down to your word alone.
You would have to create another Elysium account if you plan on using the Elysium TBC server coming out later this year. Sorry for the inconvenience.
~ Tadgh