Permanently banned even though I'm fairly sure I didn't deserve it.

I got permanently banned today for being Toxic, flamed a Nasus for single handedly throwing a ranked game. While I understand that I was toxic, I don't think I deserved a permanently ban. I've received one ban in the past, solely for using the word "%%%" in a game, which was a bit much on its own, and now I was straight up permad. I think it's really unfair cause while I was toxic, I was by no means deserving of a perma ban. Any way to get this reversed/ get Riots thoughts on why I got insta perma banned?
Report as:
Offensive Spam Harassment Incorrect Board