Perma Banned

Those links are the links to the matches i was reported for and soon to be getting banned for. I was perma banned for intentionally feeding and griefing. If you look at those three matches. i only did bad in a single match. Looking at my team's scores, according to whoever reported me i was inting/griefing. The GP game i had camille selected in champ select and my adc took it and locked in since she had first pick. She got mad at me for banning darius in which she never selected and none the less Darius isn't an adc. So the whole team reported the camille and she got banned we got the notification and it's alright but i find it hard to believe i was griefing or feeding in this matchup. My other two games i went positive and had the most kill participation. Overall i think this might be a mistake or something because i don't believe this ban is the right punishment for whatever i did wrong. Also one more thing id like to put out there the matches i play were with my brother and he has approval of what happened. My question it why did i get banned for doing well in game? Since when was it a crime to go positive in a game even though we lost i then get banned? I am 99.9% sure this is a mistake on riots behalf. i'd really like to know what i had done wrong here. Feedback would be nice. Thank you!