Why are intentional feeders not banned?

Sent in ticket, response is "Intentional feeding players recieve a 14 day ban" I'm like, Great! This guy who inted in my ranked game won't be allowed to play for awhile, that'll show him. Nope, no ban sent. The Lulu's chat logs literally say "I dropped from gold, I dont care anymore, going to int" he then proceeded to run into the enemy team for the rest of the duration of the game specifically to make us lose. NO PUNISHMENT GIVEN. Why is this the case? Why does he get to break the rules even though I send in not only a report in game but a support ticket specifically to get him punished. Injustices like this are what prove to him personally that he CAN get away with inting. This isn't ok.
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