Report system is bad.
Well the report system just punishes people who chat, but my last game I had a duo that were sitting in several places and just dancing, in ranked!, and the did not talked in game, just at the end of match they added me to say "you like your lost game?" and are verbally abusing, I send a ticket a say they cant do anything, for real? these are the real cancer of LoL, not flamers, because flmers keep playing, what do Riot does about this kind of people that dont move and troll. You report them but with no chat, the system does not recognizes anything, and with 1 kill they told me "I got 2 kills, they wont do anything to me" and sadly they are actually correct.