Hello Dragon Saga,
I have heard that when someone is banned from the game doesn't get any mail on their emails for how long and for the reason exactly that they are banned, or even in the game they just know they are banned. My suggestion is to have a feature in the client where when someone who is not permamently banned and tries to log in will have a window that tells the player for how long he/she is banned. If not that then a mail to his/her email that says that the player has been banned for the x reason until the date the ban ends.
Thank you for your time.