My account was permabanned and I don't know why

I logged into my account not too long ago to find out that my account had been banned. I had gotten angry during my last match where I was getting both camped by the opponents, and trolled by an udyr on my team. I had raged at the udyr, but later I apologized. I don't understand the context for a permaban. I could understand a chat restriction, or a chat ban, but I really don't understand a permaban. Edit: I just want the account back... I didn't do anything unforgivable, I promise not to do anything bad like that again
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