Trolls, AFK's In ranked game and riot bans me for flaming these persons

Literally im sick of this i get trolls in last 4 games of my placements i get placed in bronze i get mmr for wooden 5 and then these "players" get angry i ganked them and i took the kill he goes afk and trolls Okey riot and then you ban me [(https://www.pinterest.com/eminemac/pins/).