I believe I have been wrongfully suspended

I have already read what it says about suspension and that I can't get my account back, but I at least want some more info.

I received an email today saying this, "Greetings ninjadachshund,

Actions that have been performed on your account are in violation of the League of Legends Terms of Use. You can review these terms at http://www.leagueoflegends.com/legal/termsofuse

Due to the severity of this violation, your League of Legends account has been banned until Mon Feb 22 22:22:22 UTC 2100

If you have any questions, contact our Player Support team at https://support.leagueoflegends.com/home

Riot Games Player Support "

I haven't played League in several months, and when I did I never said anything rude to anyone as I myself am pretty bad at the game, so i didn't criticize anyone. I've never been on any forum for it, so it's not like i was being rude outside of the game or anything. And I've also never downloaded any sort of hacking or "third-party software" for the game. I'm pretty sure my account wasn't hacked, because I had no new matches played since March of 2016, and I also still have access to the account with the same login info. I just wanted to see if maybe someone else experienced this, maybe it was some sort of mistake, I don't know. I was looking forward to getting back into the game at some point to play with some new friends, but then this happened.

Anyways, thanks for reading all this. I hope I can get some feedback.

P.S. Sorry I posted this in the wrong place the first time.. never done this before