Horribly horrific game (chat wise) and need help with getting copy of chat.

So I just played this horrible normals game. I did not do well at all. I also noticed in the pre game that we had 2 diamonds (at least last season) and a silver while I am Bronze 3 and my friend is unranked so I wasn't expecting to do super well.. So the game goes on and the top laner (Alistar) dies to the enemy Darius and immediately starts BMing. This continues through the entire game with eventually the Mid laner (Vel Koz) joining in. I put my 2 cents in a few times as well but nothing i would think is toxic or rude behavior. (if it is then I apologize) Skip to the late game. I steal a kill from Vel Koz because I knocked an enemy out of his ult and kill him (I am playing Poppy) and he posts in the all chat to report me. A few minutes pass and the top laner chimes in with the Vel Koz telling the all chat to report me for being "toxic the whole game" and that I said they "suck ****" and that I told them to "commit suicide." Now I know for a fact I never said those things and so did they as did my team. But the enemy team doesn't know that. I couldn't believe what I had read when I saw that get posted. I could be over reacting to this (and most likely am). In the future I am just going to take my friends advice and not type in chat at all unless necessary.