Can't re-register domain; says it's still in use

I posted about this before but forgot about the thread until after it was archived, so here's this topic again.

I closed my Homestead account in August for personal reasons, but I made the mistake of not changing the e-mail address from my defunct domain to another one on an important account, and now, for whatever reason, my password for said account is no longer working, and I can't reset the password because the address to which it's attached no longer exists. I came back to temporarily revive the domain and the e-mail address, but it says that it's still attached to an account, presumably my old one, so what do I do?