It's not really so much direct wintrading people do but instead they play until they have reached their desired rank, then troll the absolute shit out of CC games on their smurf, that includes playing totally new roles or sniping people that could endanger their rank. So brace yourself because the hard trolling is not even here.

If you just get trolled by one person, find him, look when he is gone otherwise if he was on your game wait 5 minutes and queue again. The chance that you line up again will take so many games.