Riot Stop putting diamonds and plats in my games

Im not sure what I have done to be matched with these people but it sure as hell wasn't me playing at their level.

I have had a diamond or a platinum (most of the time three or 4) in almost all of my recent blind picks or team builders. ranked has been fine, I have been appropriately matched but I spend most of my time playing with friends ( who just started playing)

im fine if they show up in aram or dominion because those are kinda just for fun. But I don't even want one on my team in summoners rift, it breaks the game so much! It is the most anti-fun thing I have encountered

If you review my recent match ups I'm sure you will see what I mean