Opponent rage quitting in champs leads to no win

I have just finished a game in weekend league in which I went 3-1 up in somewhere between around the 15th-20th of in game minutes. He paused and quit the game. 

It then came up with the normal you win screen. Then quickly a pop up saying reviewing the game came up and then when I got back to the weekend league menu area the game hadn’t registered whatsoever.