my account got perma banned for being toxic and i need help

So, Im playing league from Feb. 2017 and i got a 14 day ban 3 weeks before today for the same reason and now im perma banned, but i dont think that the things which i said were worth a perma ban if someone can help me i'd appreciate it.I've spent a good amount of money and time in the game so i'd like to get my account back.
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