When aftergame report doesnt seem enough

Hi, I just have a gerneral question: If somebody in trolling the whole game, feeding intentionally, selling his items and buying 6 Phage as Cassio, what else can I do to punish such people? The usual ban after the game doesnt seem enough for me, because I rarely get the message my reports lead to a punish... Even if this guy did this in 1 game only he deserves a punish, no? Btw he picked cassio in adc role cause i didnt want to swap my midlane with him... So is there a way to contact Riot on another way than the report after the game? Yours VipSaN
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