I was banned for AFK'ing, but I wasn't even online?

So i admit, in the last week or so, I've had to DC twice, in a ranked game too, because things just came up that were more important then a video game. However, after serving a 1 day then a 3 day ban, i committed to only playing league, especially ranked games, when i knew I could. With that in mind, you can imagine my surprise to log on this morning, and it tells me I'm banned for 5 DAYS. While most of you would just dismiss me as a liar, trying to not get punished, my counter is to that is I HAD NO POWER IN MY HOUSE. Last night, i finished a game, and I was just looking at champions i might purchase in the league client, not even in a Que or anything, when the power died. Everything in my house just went black, and I was even thinking "Oh, im glad it didn't happen mid game", and i just went to bed. I wake up, and i'm banned? Like i REALLY COULD NOT HAVE BEEN PLAYING AT ALL, the power was out. WE EVEN DONT HAVE SCHOOL TODAY BECAUSE THE POWER WAS OUT ALL NIGHT. So....can anyone explain this? Also, if you really want proof i live in the seattle area, so if you need to look up a news report of the whether or whatever, feel free.