Banning after leaving game in ranked mode is ridiculous especially with players

How is it ridiculous, if it's there because of toxic players such as you've described yoursef to be? You only get bans if you leave before timing out, among other general reasons. Poor skill based matchmaking is one issue, but you dug your own hole by leaving without giving your teammates a chance to revive you. Next time don't leave prematurely, and then afterwards join the mass amount of people who agree that the ranked matchmaking system is broken.