I dont understand the 14-day ban i receive, need more information

I just got banned 14-days for a ranked solo/duo q match with an afk in my team, this is who the chat looks like

Game 1 Darma: dios mio Darma: no Darma: usted no Darma: BLOO NO ME HAGA PERDER MAS PARTIDAS Darma: POR FAVOR Darma: ya mi elo no aguanta mas Darma: maldita sea Darma: no mas Darma: brb kms Darma: gj Darma: c: Darma: corki ill be camping mid once i get 6 Darma: thresh e Darma: no se como me pego la q si la "esquive" Darma: everyone is Darma: bot no sm btw Darma: bot no sm Darma: lane gank Darma: no use el flash creyendo que no me iba a matar Darma: me saco 450 con la r a nivel 1.. Darma: thresh puso la ward por fuera hahaha Darma: take top Darma: she tp bot Darma: gj Darma: estaba afuera tambien? Darma: hahahah Darma: ... Darma: corki dc. Darma: we will lose 4 v 5.. Darma: quedemonos en bot Darma: ? Darma: just run ffs Darma: OKAJDHGFSTDCUSJIPOKD Darma: this fucking shit Darma: j4 come on help me to peel tristana Darma: help me to keep tristana alive and we will win Darma: lest do pick up... Darma: seems that we cant kill anyone Darma: bg Darma: GO KYS Darma: coki Darma: just kys

Corki disconect twice he never say a word, no ms ping nothing just dc, the spanish conversation is with a LAN friend that im playing here in NA got random qued together, the traslation is something like "Bloo dont made me lose more games, please", so i want to know why is that you are banning for that game, i have try to be as positive as i can keeping teams positive even when losing, the most rude thing is when i run out of patience and type kys or something like that