Please help me understand why i was banned?

I was banned last night after a game, for "Your account has been permanently suspended following the use of scripts, hacks, exploits or unauthorized third-party programs in League of Legends." I have never used any type of programs on my computer beside curse or mumble.. I am in bronze 3 with a match history of struggling games and a few decent ones, with nothing that jumps out say "hey this guy might be cheating". The only report/warning i have ever received was from last season and that was for being toxic... the only thing i have ever done in this game was that could be considered bad was get into a game with a smurf.. can i be banned for playing with someone who is a division higher then what im suppose to be in? look and match history can you can see for yourself there is no way i could be cheating.. SDX1
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