Ranked Issues

You know... it was just so unlucky... that our Mid-Lane Last night complained fighting a Fizz as a Zed, so our Malzahar says ok, go top and fight Vayne, and Zed was like EASY I POP HER! He dies to her and then just rage quits the game. Says "I'm done." The sad part is, we weren't even doing bad! We were almost winning as 4v5! The more annoying part is... Riot lets us get punished for unfair matches like this, and we lose our full LP, why can't it be a third or a half, or even refund it. It isn't our fault if our players rage quit past the mark for DCers.