Banned without doing anything.

Last game, I played an ARAM 5v5 and I disconnected due to internet issues, we still won that game. Then when I woke up I recieved an email to me saying that my account got banned until FEB without even telling me the reason of my account suspension. I am 100% sure I didn't flame and your account can't be banned for disconnecting. This doesn't make any sense. Reply ASAP, Thanks.
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