Difficult teammates who aren't willing to communicate and probably aren't being banned

This post probably isn't going to gain traction or do anything significant but I feel like the issue that I have with the community can be related to by any player of the community who has played this game on a regular basis. Please note that the game I will describe can have teammates with these problems up to one in five games and I wouldn't be making a post unless the frequency wasn't becoming extremely alarming and significantly detrimental to the environment in which league is played in.

So I hop into a game of Dynamic Queue with 2 other friends just looking to gain that sweet sweet LP that everyone desires. Champion select proceeds to go without a hitch and we are in the game looking to grace our monitors with the fancily-lettered victory sign. About 5 minutes into the game we all notice that their Udyr is AFK and since this is ranked we look forward to the free victory (we also planned to report the Udyr after as we can all relate to the pain of having to play a 4v5.)

The game goes back and forth and as the game progresses our Singed starts to show signs of passive aggressiveness and refused to communicate with all other players. He makes questionable plays causing the 4v5 to become much more challenging. Eventually this continues without any sign of improvement until we are at an extreme deficit to the enemy team and the Udyr proceeds to reconnect. The game degenerates into a shit-fest with the singed becoming exceedingly toxic towards me even though I am making significant contributions to the team while he is quite likely the opposite as he never groups and doesn't really do much other than be like a psychotic EX girlfriend who suffers from bi-polar syndrome (the singed swings from saying nothing to bursting out in extremely aggressive bouts of flaming out of frustration) .

We proceed to lose the game and he continues to flame me in the post game lobby and then I take the initiative to report him as I feel he isn't a positive member of the community (I believe everyone else on the team reported him, including the one person who wasn't a premade, obviously excluding the singed). It is then I observed that when I reported people I would never get a notification that any punishment/form of justice has been put in place to stop this type of behavior from spreading in the past. This brings me to the unfortunate belief that the automated report system does not cover these more subtle types of toxicity with in the game. I don't really have an idea on how to fix this but I am hoping by posting this here that this issue can be covered by somebody of a higher power.

TLDR: Reporting system doesn't cover certain types of toxicity and stubbornness which can be hard to detect by an automated system