How to punish a troll

So, i just finished a ranked game. During champ select this player named **[removed due to Naming & Shaming]** was assigned to mid, he wanted to play as Yasuo, but then the other team locked Yasuo. This guy instalocked Xin Zhao and said "top", we told him we would report him, he said "idc", because of this our Shen, who was supposed to go top had to go jungler, I have this printed, i just cant find a out to post it here. What rlly triggers me is that, if i am in a normal game and someone trolls they say "its normals", then you go ranked and think it will be any better and ppl do the same. Is there a way to know if this guy will get any punish for this?
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