Can you answer me this specific question. Please?

Hey! I just had 3 ranked games wins in a row I got promo and guess what. I have a baboons in my bot lane. Vayne 1 level rush in bush get killed followed by ape sona few mins later 2 lvl sona come to my lane(mid) to support me. So my question is why before PROMO I didn't have baboons but when I have to rank up I match with the worst possible apes? EDIT: I got this message few mins ago: But I usually report all the trolls , so how can I be sure that is this specific user? Thank you and have a nice day!
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