Permanently banned

So basically a few weeks ago i got perma banned in league. I've been playing almost every day from 2011 to 2017 then playing ocassionally every few months, i have never been the most friendly person i had my toxic moments. I have been chat banned a few times but that was years ago, probably 2015,2016. Since then i did not get any chat or game bans. And now BAM i get permanently banned after few games of being toxic and i only said "f**king idiot" or "%%%" a few times , nothing racist or something like that. Why did they immediatelly ban me instead of giving me a chat ban or a 1, 7 or 14 day ban?? I made a ticket today , what are the chances that the ban is a mistake and me getting unbanned? Thank you if you respond.
Report as:
Offensive Spam Harassment Incorrect Board