I can't climb out of B5?

So I expected to get put in B5 this season because I had gotten placed into it last season as well but I had never bothered even attempting to climb. This season I did get B5 and I started climbing about a week ago. My MMR is currently 962, and whenever I play a game I always win it except for when i get into promos. I've reached 100LP three times so far but every time I do I get put into troll teams who int feed or afk at base. This has happened every time i play a promo game without fail. I'm a one trick splitpush Teemo main, and I know how to carry games with him. Is there some ranking mechanic that always messes up my promos like that? What am I doing wrong? Plz help...
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