Couple thoughts.
First, gotta expand your jungler pool if it's a role you play often.
For starters, Yi is trash for serious play. He brings nothing to the team, only the solo player.
If you only play Kha or Yi, that's already a problem. If enemy team has a couple tanks, some CC, and focus on protecting their carries, you won't be effective. At best you'll die for getting a kill and there's no advantage. You may have some good matches, but only playing two assassins badly limits you as a jungler, especially if the game balance weakens those two in patch cycles.
Second, because of the ban system, its kinda hard to blame a teammate for banning your second pick jungler if you were showing your first pick and enemy team bans it.
The simultaneous ban thing needs fixed for ranked at least.
Third, there is some sad truth to what others have said. Riot expects you to take flames and trolling on the chin, stay calm, and only report them after a match. It's pretty trashy, but that's what Riot has set up.
I would suggest taking the ban time to explore other mobas and games to have fun in.
Similarly to you, I got a chat ban rather unfairly for "harassing" someone who trolled as support and took over mid lane, ruining a ranked match. (Apparently talking among your team about what that player did to ban our teams jungler choice, pick a troll support, and steal all the mid lane cs he could is "harassment".)
I had enough, and have uninstalled LoL. I came to the realization that the game simply was not fun at all anymore between shit balance, biased skin releases, garbage lore revisions, and awful player base.
I'm not happier, because I haven't found the right game yet to enjoy as a pastime, but I'm not angry and frustrated like I was playing LoL.
I'd suggest considering the same.