Got permanent ban. First time reported. Help!

What can i do? I've got reported by somebody that was being really mean and toxic since minute 1. I was trying to be calm, but he even made quit someone from our team (that person went AFK) because he was super toxic. I got mad, and i couldn't help it, and insult him back. He said he was gonna report me for being afk and insults. My team, and the enemy team reported him and im sure he got punished, because the system told me, but then when i was on the next champ select, it told me that my account was suspended, and surprise, it is permanently suspended. Why? Help!
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