Trolling Supports?

OK, a question... What are you supposed to do when you get a trolling support? Picks non supp champion, takes your farm, let you die on purpose, etc. etc.? 3rd game today, same thing. Draft pick exists for a reason, to be drafted to a position, right? So how to battle this? How to report it? Are there sanctions for it? Let's say you win the game, let's say that non support guy even carried you all. HE STILL trolled you, tilted you and basically ruined your whole game experience. So, what now?
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