Got banned literally for no reason!???

So, here you can see my chat history I've got banned for.: "Game 1 Pre-Game TripoIis: jg In-Game TripoIis: ty TripoIis: wtf TripoIis: gj darius TripoIis: how TripoIis: I CANT JUNGLE? TripoIis: ok bro xDD TripoIis: tell ur friend darius that next time not to take my blue at level 1 TripoIis: ty TripoIis: i dont really care dar TripoIis: just brand provocating me TripoIis: yep TripoIis: I cant play jungle xd TripoIis: but u cant play mid TripoIis: what is a gang? TripoIis: there is no word like gang TripoIis: xDDDD TripoIis: ty bro TripoIis: i am reported for killing an enemy TripoIis: than u are reported for assisting enemy TripoIis: xDDD TripoIis: and?? TripoIis: yep TripoIis: lol TripoIis: he asked reason TripoIis: xD TripoIis: dont u say TripoIis: sure he is TripoIis: ty brand TripoIis: for losing the game TripoIis: xDDDDDDDDDDDDDDDDD TripoIis: what a skillful player TripoIis: totally not bronze TripoIis: XDDD TripoIis: he is an ap mage :D TripoIis: XD TripoIis: learn to 1v1 TripoIis: xDDD"

So, the game.: Darius took my blue at level one, I didn't say nothing offending, only wrote "wtf". Than, Brand died against Lissandra like in every minute, and than blamed me that I can't play jungle when I had a descent stat while his was horrible. He said I couldn't "gang", and I just replied that there is no world like "gang", and wrote "xDD" because I have to laugh if I see someone writing "gang" instead of "gank". Brand said "reported" when I killed Lissandra, and that's when I wrote: " i am reported for killing an enemy; than u are reported for assisting enemy ". Some minutes before the end of the game I just told to Brand that thanks for losing the game, totally not bronze. The question is, why am I banned for that???