Lagging in Ranked

Hey everyone, so recently in one of my ranked games, I happened to have terrible FPS (below 10), however my ping remained constant. It was really frustrating to deal with and essentially impossible to play with. So with no choice I had to restart my computer, reconnect, I joined the game and we won. I was really disappointed to learn that if you leave a game, even if you reconnect you will be ineligible for any points of promotion in League. I'm sure this has happened to hundreds, if not thousands of League of Legends players in my scenario, so I just want to hear your thoughts on the opinion. Thank you.
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