if it helps, what you do is send in a ticket to support and you give them details on what game you encountered the verbal abuse.
Riot in turn will examine the matchup, scan the chat logs and apply judgement accordingly.
You are a credit to the community by reporting such players.
And I'm not the only one who would suggest the same actions.
The link for support tickets is on top of the webpage here. (SUPPORT)
or you can copy/paste this into your browser address bar : --> https://support.riotgames.com/hc/en-us <----
Good luck!