Chat ban? Really??...

So i insulted a guy who basically instalocked and stole my lane, i had to walk around for 20 minutes with 14 farm, i almost died for the jungle and even did my best to get a good score and help my team while he was just crap, and I... yes "I" get a chat ban... Dear Riot Games is this how your system works?? Are you joking? What is this?? Please explain me because i don't understand. I don't deserve this, i do NOT.
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