Int feeding/running it down mid.

I reported someone for int feeding, the player raged at his support because they got doublekilled at lv 1 then proceeded to feed the enemys. He died a few times to my laner aswell but it was still a close game since I managed to get 31 kills by the end of the game. The person ended it with 1/15, how come he isn't getting banned? The "just a bad game" excuse doesn't work in this scenario I'm afraid. I tried it myself, I inted 1 game on my smurf and got an 14 day ban directly 4 minutes after the game ended. How come this player is allowed to keep going?
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