Permanent bans

Hey, i've been playing the game for quite some time and as everyone i sometime get tilted... so when there's was end of s7 i tried to push ranks and tilted a lot more than usual and treated people way worse than i should( which i deeply regret now) , so i got permanently banned but as I want to come back to the game after some time ( probably a year or so ) i want to continue on my account for obvious reasons and now i'm wondering if it's possible to undo an permanent ban ( wouldn't be so permanent then but w/e ) .. Are there any cases of players getting unbanned or is there no hope ? Thanks in advance ! :)
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