got my account banned not my fault

i got my account banned along time ago on the username applemonkey2001. i was just gone for like a half hour to the supermarket with my mom and when i came back my account was banned. i looked up on summoners companion i saw my match history. and i saw that somebody i didnt know played with my account because he played with a friend 3 games. i can still get on the account so pls get me unbanned. somebody hacked me i think.
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