OMG he was caught right on tape!
Just take a look at how Augsburg's goalkeeper Marwin Hitz blatantly tried to sabotage a penalty goal from Cologne. He dug his heal to the place where the ball is to go and see what happens next:
As you could see the penalty was unsuccessful due to the goalkeepers theatrics. And worse yet Augsburg went on to win 1-0 against Cologne that night. Let's just hope that Hitz has learned a lesson from this (though the way he did it in front of the referee, makes him a bit of boss - no one has these kind of guts).