Number of AFK players on ranked is growing!

Last 4 days i lost more than 3 out of 7 games because of afk players in my team. If i didnt have this problem i would have been promoted. Now i have around 30 lp becue of afks . The problem is that players who leave ranked games are not punished . If it was normal blind its ok for me but ranked. Is this happening only in bronze and why this playes are not punished?
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