Tried to register domain and got logged out during domain verification

Tried to register domain and got logged out during domain verification

...now the email addresses I used aren't recognised, so I can't log in, or reset the password, but if I try to start again, I get the message: "* This Domain is not supported or is already registered with Zoho"

I've just tried the support line, but was on hold for a long time at position "1" with no answer.

Any ideas?