Banned and deranked for disconnecting then rejoining a game that I finished and won

[willyboy123123]

I just got a temporary ban and a derank for a game that I disconnected from even though I came back and we won the game, I got disconnected from the game early on then it took me a while to come back but when I came back the match continued and we won then after the game I saw that not only that I was deranked but also temporarily banned until 6pm later today