引用自 gargona：

I got banned for nothing. I just downloaded Dust 2 and got a Vac ban right away. I swear I didn't use any cheats.

1 game ban on record | Info
129 day(s) since last ban

and you only now noticed your gameban. Irrelevant what ingame says, as per your profile, you have a gameban, which is given for one of a few things, yes cheating is one of those things but not the only reason for a gameban. Also your ban is permanent