Didn't Receive Mark of The Betrayer Icon

I just won my 3rd match of Hexakill, yet I did not receive the icon. Here are the matches below:

Match 1: http://prntscr.com/50twkp Match 2: http://prntscr.com/50twv0 Match 3: http://prntscr.com/50twhq

To view my match history: http://matchhistory.na.leagueoflegends.com/en/#match-history/NA1/212054027

Please help me ASAP, I really like the icon and I can't wait to use it! Thanks!