I have got falsely reported

Hello riot, I am Husnain from the account on EU NORDIC & EAST and my account is iAmHusnain. Today Monday 16th April 2018, I had a match and I played the role as ADC and I was Kai'sa and in the match I have got my first Pentakill in my life and I was too happy. My friend had to go soon so we done a match and we lost. I decided to record my Pentakill but suddenly I have received a message on my LoL client saying I got banned. I got shocked didn't know what I did wrong then I re-logged to see that it was false or it was a prank or something but it was real and it was saying I was abusive. I wasn't abusive at all I only tried to help the team and my support couldn't play good so I have got a bit angry but I wasn't that much abusive to him I only said he is Trash and he was 0 at the early game that wasn't abusive. Here the links about my ban and chatlog: https://media.discordapp.net/attachments/308317744594550784/435466716525494272/Screen_Shot_2018-04-16_at_16.45.27.png https://media.discordapp.net/attachments/308317744594550784/435466719209848842/Screen_Shot_2018-04-16_at_16.48.03.png https://media.discordapp.net/attachments/308317744594550784/435466719872548885/Screen_Shot_2018-04-16_at_16.48.10.png https://media.discordapp.net/attachments/308317744594550784/435466721080508416/Screen_Shot_2018-04-16_at_16.48.14.png
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