Perma Ban Appeal (Was it an Accident?)

So I was playing a ranked match today and I've had a lot of particularly bad games in the past couple days. I've reported several team mates for harassment and toxic behavior because I wasn't playing my best etc. or they were intentionally feeding, things of the like. In my last ranked game I was doing pretty well, our team was looking good, although I made a couple mistakes and ended up falling behind pretty quickly because of a Corki player who dove into several enemies by himself then continued to blame me for my 'trolling.' Other colorful comments were made by this player that required me to mute him for the rest of the game, but I toughed it out and continued to play with my three-man queue partners. The game did not end well for us unfortunately, and I was relieved when I got report feedback stating that the Corki had been penalized, but seconds later I was permanently banned from my League of Legends account. I might have been rude to Corki after being antagonized, but is that really grounds for a permanent ban? I've never had restrictions on this account. I assumed this was a mistake, but if someone from Riot support team could shed some light on this situation I'd really appreciate it and if I was considered offensive and worthy of a ban, please inform me of the reasoning so I can fix my issues and regain my account if at all possible. I also posted a screen shot of my client to show my feedback and permanent ban status. Hope this was a mistake. Everyone has bad games.