When a player using cheat will be banned ?

Hello all, 

Last WL I play against a player which use cheat. When I enter in the game all my player get selected and get stuck. And to make it even better, after 2 matches I  played again with this player who was using a hack even though he was reported. To be arrogant, he even accepted my friend request...even now after so many days he is playing. How is this possible? (name Fenix4yt).