Your reports probably hold little to no weight.
If you report too much, your reports end up being worth less, and less, and probably after a while, your reports mean nothing. Personally for me, I don't think reports do a thing at this point, unless the person that is being reported has the same attitude for the next 100+ games.
I know for sure that my reports are worthless at this point. I've reported many people who are openly toxic in the postgame chat, and because of that, my reports mean nothing now. Riot has pretty much trained me to continue to let the community be toxic, and make the community on par with that of the Call of Duty community, since I notice that none of the people who I report end up ever getting banned, even if they used the most vulgar insults, and made the game extremely negative.
Sorry for your terrible experience. I'm sure many others on this forum share your sentiment, since people on this forum talk about this on a near daily basis.