account boosting smerfing

Is there a place to report theses guys. Played a game today and looking at stats last 50 games only 2 losses most of the wins were at 20 mins. 48-2 no way riot should leave him in B1 .Prior to the last 50 games win rate was close to if not under 50% with a cs average of 100. Last 50 games cs of 200 plus kdr in the 22-25/2-3/ 5 ish. Prior to that kdr looks like mine some great looking games some you wish you never played. Damage to champions is well over 20k in most matches at the 20 min mark, while teammates are at most 3-7k. Teammates are usually under 5 kills and a few deaths, so its not a case of someone just kill stealing to pad stats. The champions used in the last 50 game differ greatly to the champion pool in the games before that . I find it annoying trying to play notgreat , atleast playing in my skill level, to run across a guy like this who boost friends accounts while ruining the games of others. I had a friend start playing , he placed in like B3 after a few matches it pushed him to B1 then into mid sliver, now he is plat 3 or 4. So there is no way this guy should still be in bronze. The game pushes you up if you do that much better than others, unless you exploit it to keep you in low brackets.