Support intentionally feeds 0-18 in a 28 minute ranked game and no ban??

Imagine this. You are playing adc in a ranked game and you get a Graves support without a support item. Now that by itself is not against the rules so you keep quiet and do as best as you can. Then your support dies 1 minute in the game and then another few times so he is 0-4 at the 5 minute mark. He keeps on intentionally feeding until the game ends and he is 0-18 with 3 assists. Me and others of course report him for intentionally feeding but I don't get a popup message. I check and he is still happily playing the game. Is it that hard to create a system that picks up this kind of behaviour and then punishes the player accordingly?
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