Killed a bot in competitive matchmaking today because I threw a decoy grenade at him. Got a 7 day ban AND I got deranked 2 RANKS! Now I'm a silver 4...
After you get a 30 minute ban, you get a 2 hour ban, then a 24 hour ban, and a 7 day ban. Therefore you have been banned at least four times in a set amount of time.