permanetly banned

I recently got permanently banned from League of legends on an account that I've been using for almost 1 years now. How can I repeal the ban or prove that I have reformed? I know a lot of people say that if you 've gotten permabanned, you don't deserve another chance, and that Riot is not willing to repeal any bans, but I have serious anger management issues which got the better of me in the last game I played with my friends. I would also like to note that I never received a chat suspension, or if I did it was so long ago that I cannot even remember. I think it was 4-5 months ago that I got a 2-week ban, and I hadn't been toxic since that until this one game{{champion:119}} . I've never fed or trolled in games, and I'm more than willing to disable /all chat if I return on this account. I know that it is possible to remove a permanent ban.
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