Hit My Promos and Someone Threatens to Feed Mid.

Hello all, I am a B1 player (don't worry i know I'm bad, lol) who has climbed out of true Elo hell all the way up from B5 to B1 and in to my promos for Silver. i was exited to play my next promo game because I had won my first one. out of no were, my mid lane types in the chat "feeding mid. (or something along those lines)" Nether me or anyone else on the team had said or done anything when he typed this. I'm not sure if he did this knowing I and another player were in our promos or not, but whatever the reason it dosn't take away from the fact that this is so fckd up and this player needs to be punished the same way a person who actually ints gets punished. Sry if I sound whinny its just a big loss to me, especially when you consider I'm in my promos. anyways, as we rolled threw pick stage he continued to say stuff like "unless you dodge, i'm inting" and "No matter what your losing" when me and my team begged him to not int and what not the only response we got from him was to insta-lock Temmo. All I ask from RITO is to punish this player (Dont know his username but if there is some way to go back and look threw my match history that would mean the world to me) and if possible to refund that loss to me. Anyways I dodged and that was that. The only thing I hope can come of this story is that riot looks into ways to stop this, if someone says "I'm inting" then they should get punished. I didn't stick around to see if he actually was going to int, but he did insta-lock Teemo with the devil skin so...