Leavers in ranked games

I don't think the penalty for leaving a ranked game is sufficient enough, I have had leavers in 9/10 of my ranked games, and at least half of my placements had leavers on my team. Which is why I was placed at bronze 2.

It got so bad to a point where I had 3 of my teammates back out in a single game. It was a 2v5 in ranked... this is getting ridiculous.

They need to make the penalty more harsh.