Unknown ban

I received a perma ban for what I'm understanding an unknown reason, I have been banned in the past with a previous account that my brother (seldom) and I played, took a break from league to reform, came back, no issues, until today that is. I took screen shots with my email name removed, showing that my most recent look at my email that I got nothing from Riot games or League of legends, besides my most recent being league related was gosu streaming, and my most recent email of all being from five below. I can still sign onto the account that was banned and shows "banned for toxicity", I got a reason as to why i was banned, but this one was unknown of, I have no chat restrictions on this account, no suspensions, or warnings post game of me being reported. If I have been banned and were told, I would leave it at that, but this is not the case. The only possible explanation I could think of, both used the same email address, which shouldn't be the case considering I played for 7-10 months (ballparked I can't remember exactly) on this account with no issues. http://i.imgur.com/eP8w4QM.png http://i.imgur.com/qOckv2t.png http://i.imgur.com/Hfq4BLZ.png http://i.imgur.com/wuV7utH.png

I apologize for the crappy images, and if there's a need for better images please tell me how.