Super-Admin left the organization and I am unable to access

Super-Admin left the organization and I am unable to access

Hi, 
I had a super admin manage my emails. He has since left the organization and gave me the login information for the account. However, I am unable to login and cannot obtain the correct login credentials.  I attempted to create a new account and link and verify my domain but was unable to because the system said that the domain is already in use/verified.  How can I either access the super-admin account or re-link my domain to create emails? Domain is www. bullieslife (dot) com. 

Thank you.