Problem with my business email account

Problem with my business email account

Hello,

Today I've try to register my domain at zoho as business mail account. I have already send verification code, and I can login in to my email account at zoho. After logout, everything gonna wrong. I can't login. I can acces my email. And many more. So I close my account. And I try to register again, but it's not working. Zoho said, somebody (still) use my domain.

Is there something happened? Can you help me to fix this problem?

Thank you

Hendro