Hi, it's impossible Joomla doesn't allow you to delete super administrator. Of course I can check if you have access to FTP. If yes send me access (server name,login,password) + URL via PM (ONLY!)
You have database probably on godaddy.com and I can not manage mysql from Adminer & FTP.
I will try copy my version of phpMyAdmin. if this doesnt help, we must think about access to Control Panel in your hosting account to access phpMyAdmin. We will be in tough.
This is hard case, even when I import users still /administrator - says: "Login denied! Your account has either been blocked or you have not activated it yet." what is not true.