Cheating the system

Just had a game where someone got autofilled support and just simply refused to engage into the game. They bought items, they stood in lane, and just did nothing. Waiting around until the game lost, griefing everyone. Refusing to assisst the ADC in the fights bot lane, never helped the jungler that got invaded. Just sat around waiting for the game to end whilst trying to bait people into flaming. How the %%%% does one report this to make sure this person gets punished? I can't think of anyone I played with in a long while that deserves more of a perma ban.
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