You have been banned multiple times in the past and continued to come back time and time again and not follow the rules, this is most likely why you were permanently banned. Oh and if you want to be unbanned this is the template:
[b]Name -[/b] What is your in-game name?
[b]STEAM-ID -[/b] What is your STEAM-ID?
[b]Admins Name -[/b] Who banned you/who might it be?
[b]Reason -[/b] What is/might be the reason that you got banned?
[b]Server -[/b] What server did you get banned from?
[b]Time -[/b] How long were you banned for?
[b]Story -[/b] What happened?
[b]Proof -[/b] Any proof on a video/screenshot that clearly show what happened?
[b]Extra Information -[/b] Any thing you think may be relevant to your ban.