Mistakenly banned for MMR Boosting?
So yesterday i got banned for "MMR Boosting" even tho i never shared my account with anyone... Here is my profile: http://eune.op.gg/summoner/userName=ru%C5%82e Is it possible that i got banned because i played league in school and i let me friends that never played league try it out (in normals and custom obviously)? Please help or at least explain to me why i'm banned.
Edit: And here's the funny part. There is an account that me and like 6 of my friends use daily and it didnt get banned but my account where only i play on it got banned XD