How to start a new account when your domain is registered with an old account?

How to start a new account when your domain is registered with an old account?

My old account has been hacked, And i no longer have the login details of it.

It currently uses my domain,

However I'm trying to set up a new account and all it says it "Domain already in use"

I tried emailing zoho various times but they didn't reply!

Someone please help? Is there a way i can delete my old domain from the system so i can link it up to my new account?

Thanks