You can delete Web hosting on control panel.
1. Move to detail page of web hosting to delete .
2. Click "MANAGE" in "WEB HOSTING SETTINGS", and click "Delete" in menu.
3. Deleting a domain will delete the mail account and mail associated with that domain.
Also, if the domain you are deleting was one of the last ones registered in your webspace, your webspace will be deleted at the same time.
If you are satisfied with the above, click "OK".