Change Domain to Previous Name

Hi everyone, I was locked out of my previous Jira (it became a managed account and my organization wouldn't allow me to log in, I've given up) and it's now deactivated. I made a new one, but I'd like my previous domain name back. Is there any way to do this? When I try to input my previous name, it says the name is already taken? I'm having a hard time trying to contact Support, so hoping someone here can please help - thank you!