Error With SMS Verification & Lost My Email Address

Error With SMS Verification & Lost My Email Address

Hello support,

I register with this email adress" az.ripon@zoho.com" but get one error on verify Mobile Signup, then i try to register again but now it say the domain is already registered, i am unable to login to  az.ripon@zoho.com account.
On the other hand, i filled the account password using Last Pass Generated Password.
So i don't even know which password actually used for this email account!!
Now i want to delete the email address & re-register it. 

Please, help me.