Why the hell im getting trolls only in promos ???

what the in world is happening ? everytime the matchs before promos goes really fine i reach promos i get games with ragequiters hardcore flamers and trolls. i jump into promos the first match with shaco i get a troll cho gath that goes 0/19 in 15 mins so i lost promos and again im in promos and i get a vlad that decided to troll and feed because diana took only 2 cs in mid and tristana ragequitted and kept flaming her support for almost no reason im really mad if everytime i jump to promos i get such uncarriable teams .
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