Banning someone for int in a ranked

I have a quick question: Will someone get banned for inting in a ranked, fully on purpose inting, even if it was the first time? I am asking because I had a Jax in my team recentely who did exactly that. While I dont care that much if it happens in a normal, a ranked is a completely different matter! Ranked are serious buisness, where trolls should get extremely punished. I, and very likely everybody in both teams, reported him, but he still played atleast 2 games afterwards! I dont want to name & shame someone, but I'm sure you can find him easily if you look up my recent games. That beeing said: I atleast expected a temporary bann, atleast! So why did that not happend?
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