problem when sign up

problem when sign up

Hi,
Today, i sign up new Zoho mail services. But when i press Finish, maybe I enter wrong mobile number. So i cannot receive verification code. After that, i click BACK to edit it but i cannot.
I sign up again but i recieve this note: " * This domain is already associated with this account "*****96". Sign in"

Can you help me this problem?

My domain is: saigonenglish.vn
mobile when register: 0866566696

Thanks,

Phuc