this game is fair?

I was wrong in this game and was justly banned. However, my teammate banned my champ in select and told me as much just to troll. then he tried to steal all my cs and hinder the other players. This is not right. Riot please ban him for trolling, this cannot be the first time he has gotten someone banned. His name is Killerberry998 and he trolled me as 69 Redsolocup69