Perma ban

So i just got perma banned for toxicity. I dont understand why but dont they put a chat ban for a while when you were being toxic? i got banned for 14 days before, and now its perma. I dont think this system is fair to people who are trying to play and get flamed for a single fuck up, i was laning against a fed lb and she takes half my hp and then tower dives me, my adc started to flame, i replied calmly, then he started to flame me more and i lost it. i do feel like this game isnt fair to those who flame and then report someone for toxicity and that riot games should put a chat restriction not a perma ban for flaming.
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