Toxic players ruining games with no punishment

I've played 3 games today. All 3 games at least 1 troll was present. In DOTA 2 they have a "Low Priority Que" for those who constantly receive bans or even are seen intentionally feeding or being extremely hateful. Why hasn't RIOT implemented a similar successful mechanic to this game? We have the Tribunal system but, it's not enough. 1st game today I had a Teemo go 0-13 intentionally feeding. I thought ok next game cant be worse let's do another. I was wrong. My Caitlyn watched her Veigar support take 2 cs for his Q farm. She immediately popped heal, flashed into the enemy and stood there to die. This was followed by a few more then off to mid Cait went. All because Veigar took 2 cs!!!! I have played League nonstop since Season 1. I have spent over $400 on this game and am now ready at any moment to uninstall and tell all whom play with me to join me in Dota if nothing is done about the toxic, childish, self entitled community that is League. Too many players go without repercussion or little to no punishment for their behavior. Create a low priority que, ban more players, BAN IP ADDRESSES! So players cant just get account after account for $50 and troll more without care. I'm constantly getting demoted, losing both LP and MMR because of trolls. I was Gold last season and was placed Bronze 1 this season. Why!? Fix your shit Riot.