Zoho support - Change 'user'/'support rep' email address

Zoho support - Change 'user'/'support rep' email address

We have one user/support rep and I need to change the email address, how is this done?

(At the moment I've changed the email address in the 'My Account' section but when I view it in the Setup > Users and Permissions > User list it shows as the old email address but when you click through to edit it shows the new email address but notifications go to the old email address)