if you have removed the user via PHPMYADMIN and the user is “recreated” by him/herself, it sounds like the user you are trying to remove has access to manage your webhosting account. (I am assuming you know the user and have already checked for other malware)
Thank You,
I contacted the hosting provider to investigate this issue. Let’s see what they find.
Turns out, that the functions.php file had script, that recreated this admin.
