Unlink steam account from false account

title basically states the issue i need my steam account unlinked from an account i didnt even know existed i made a toon on it and all and i thought it was linked to this account but stupid me i never checked (this was made a few years ago) i tried to see through steam if i could get it unlinked through there but non luck now im trying through here i already emailed support about this but im posting here for additional help and trying to expedite this process as well hopefully