RANKED MATCHING SYSTEM

I was in silver 5 playing well had a good win/loss ratio. One game i did not lock in my champion in time, a mistake non the less and I was kicked out of my series for it. No big deal my fault....However NOW EVERY GAME IVE PLAYED SINCE THEN NEARLY HAS BEEN WITH AFKERS AND I HAVENT WON A GAME SINCE. IM BEING PAIRED WITH PEOPLE WITH 30% WIN RATIOS AGAINST TEAMS WITH 60/70% WIN RATIOS AND MUCH HIGHER CHAMPION MASTERY POINTS. IM ON A STEADY COURSE TO B5 WITH NO WAY TO STOP IT AND ITS NOT FAIR. WHY ARE THE TEAMS SO IMBALANCED IN RANKED