just either send them a ticket message on the website or email their account help email address.
in the message include: what you were doing at the time of the dc/ban, to show you were in control of the account. and give them legitimate reasons why you shouldnt be banned.. (legit player, love the game, falsly banned, etc). maybe even tell them that you werent in control of the account and just re gained control of it. it may take a day or 3 to get the response.
THEY WILL LOOK INTO YOUR ACCOUNT HISTORY. THEY CAN REPLAY WHAT YOUR ACCOUNT HAS DONE IN THE PAST. they can look at what ip addresses your account logged in from.. if you were botting a few hours before the d/c, or even a few days.. they can find that.. i have gotten 1 of my bans(permaban) quashed by emailing their account help.
i can pm you the email if youd like.