Ranked matchmaking rigged

I simply dont understand this game sometimes, because i can win like normal ranked games like its nothing, but when its promo time there is no chance to get that promotion. How many times will i have to go to those promos and not go anywhere huh riot? That many when i buy something? I dont get how people even make it to "climb" somewhere when its near impossible with this rigged system who intentionaly places the matches so i would not advance in ranks anyway. Why cant they just fix their matchmaking.
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