Unban please :)

hi i wanted to play on one of your servers today i havent played css for atleast 2 years and before that i was often playing on ur server so today i wanted to join the surf server and i get the notice that i am banned now i want to know how come i got banned and if its possible that i can get unbanned i havent been hacking or something here my steam id STEAM_0:1:52541625 hope i could get unbanned because i really like your servers