How am I supposed to deal with trolling premades?

Just had a game where we had a Master Yi & Wukong bot lane, they fed the enemy Tristana and then proceeded to troll the entire game. Since there were two of them we couldn't surrender, and they dragged out the game as long as possible.

Can anyone tell me how to deal with this? I really don't want to be stuck in a 30+ minute game with these types of people, but when they're greater than me, there's nothing I can do except go AFK (and be punished myself), mute them (which doesn't stop the fact that they're wasting my time), and report them (which doesn't feel like you're really doing anything). Retaliating would just get me into more trouble. I was Shaco, so I tried splitting but they ended up running it down mid and purposefully losing a teamfight that lost it for us.

Any advice would be helpful