Need some help on this match info.

I played a nasus support on 6/16/2019 and i got banned for it for trying to win the match. i had a bad match which is normal for everyone and yet i get flamed. i've played nasus support multiple times and won matches and lost matches. but this match was different the team decided to feed and report me for their game play issues. and i havent talked bad like trash talk or just being a troll. i was confused on this ban and i read on what i said and most of it isn't a reason to ban and the other half is maybe a chat ban at least but not a 2 week ban. maybe a riot moderator can shed some detail on it. maybe i said something out of line?