I need to remove my domain name from Zoho and I need to delete all my email accounts but I lost the control of control panel email.

I have the domain as www.hexagentech.com

I have created the email as suresh.reddy@hexagentech.com on zoho

Now I lost that email access 100%. Somebody intentionally did that I am unable to open that account anymore. Now I want to delete the emails associated with that domain completely and need to setup new email accounts. Please help me in this regard