I'm seriously considering quitting League.

I've spent over $300 on this game. Like anyone else, I enjoyed it a lot. but lately? It's been filled with trolls and AFKers, people that play on their friend's account that haven't played a single game before (it happens almost every day)... I don't know if it's because I'm B IV or what the cause might be. but this isn't the player base I used to get matched with. For a LONG time, I had amazing teammates that were supportive, that helped out, that LISTENED. Now all I get is trolls that report you for literally saying hi. I have been cursed out, bitched at, even had racial slurrs thrown at me (you know which), simply because I tried to communicate. And ranked? Jesus christ, it's even worse. I don't know what Riot did but I feel like I got screwed over for no reason. I have like 700 wins or so, and getting matched up with fresh 30s. Does that even make sense at all? I had one dude literally go in my lane and feed the whole match because I "took his lane". I was first pick in draft pick. and he didn't say a word. And this? This is a common occurrence. I just wonder, is Riot ever going to do anything about these type of players? Or am I never going to have a nice day at League again? 1 good match, 50 horrid ones. I'm gonna be Bronze forever.