The amount of crap that happens in this game and Riot likes to just ignore!

So a few hours ago i was playing a unranked game and i happend to be grouped with a team. I had all the intention of doing and trying my best. loading in game i noticed i was the only one that had rank 5 mastery with my support class champ. As im playing i start to see that the team i was playing with was in a call together to keep communication together. Well as the saying goes when you have a team that plays together you should be good together. BOY was i wrong the top laner then let his lane free farm as per their agreement do only fight eachother. i apparently didnt see or know of this so when i was in top lane to help him kill his top laner i got no help and died. THIS IS CALLED INTENTIONAL FEEDING AND THROWING THE GAME. i went back up to help the top laner again and got toxic remarks and ploys to be reported as to my "intentional feeding". This is when i started to state hey lets FF well the whole team decided against it because they were a team. Which now this puts me in a place where i have to sit in a game play it for the time being and just do what it takes to turn the game around well with no help even more through out the game it didnt work and in 30 mins we finally ffed. This is the only time ive vented about this but its the 5th time its happened to me, and Riot does nothing about but give me a restriction.