leave buster problem

okay, this is my problem i left a game last time and there are 5 games that you need to play and wait for 20 min. But when i was on the last match, it was like 38 min on the game then i afk for 2 min bc i need to pooop :D, so i reconnect on the game i played good i have good KD, my team will not team without me. So we won because i played with my team and then we end it. But before we end it my wifi drop then my ping started going up to 6k so i waited for like 3m, so i think to myself that they end the game already so i left and i saw the score board that we won and i need to do 5 low priority matches AGAIN!

its just kinda dumb that you work so hard then you got banned for 5 matches and waste your time, pls help me I am really confuse because i just afk for 2 min then i played again.