Dear Zoho!

Yesterday, I registered successful Zoho Mail with domain 7ship.com using the account khanh3t@gmail.com 

However today, I can't login Zoho Mail, system message "email not exist". 

But the domain 7ship.com still be written get in the system and me not registered back new account with this domain. 

How to restore account administrator domain names 7ship.com? 

At this time, I just registered new account with email khanh3t@gmail.com but account has been disabled. Why?