Remember, punish the guy getting flamed by the duo.
It's disgusting how Riot basically enforces you to not speak up for yourself. If there's a duo in your game who do nothing but call you out and cut you down you can't do a fucking thing about it other than muting them.
If you start having a back bone and telling the duo how it is it will just backfire on you. Why though? Because 2 > 1.
You can claim in all chat that theres a toxic duo on your team, but when they act innocent and patronizing it typically gets a "lol" response from the enemy. Then come post-game if you don't have some godly KDA your team and the enemy has more than 1 good reason to just report YOU. I got chat banned from this exact scenario. Like what the actual fuck man? I started out just typing to my own team and it just escalated to the two of them being garbage human beings. I then told the team theres no way for us to win now because the duo wouldn't follow up on any engage I made, just watching me die. Is that intentionally losing? Fuck no it's just the truth. It literally became harassment after the game. Both spamming game invites and friend requests, it even extended beyond that with i'm guessing their other toxic club members or alts. But then it's YOU that gets punished. YOU who had honor 5 last season and high honor this season. And nobody in Riot would even tell me if they got punishment too. So as far as I know I just got shit on for not letting two pieces of garbage trash talk me both in team chat, all chat, and post game chat.
I guess moral of the story is don't even communicate with your team. Don't try to make friends even though Riot keeps trying to enforce that. Don't try to settle any kind of differences you might have with anyone on your team. Don't defend yourself when some other piece of shit jumps in to back the first guy up. Even if you're right and they're wrong, you'll get the punishment for it.
Thanks for letting internet bullying have its way in your game, Riot.