In a sane world, the obvious answer would be: SEND THEM BACK. That this is a moral quandary for Spong--or anyone else--is a pretty sad commentary on our times.
I'd send it back, as somewhere someone could have recieved a solus copy of Tearaway when they ordered a PS Vita Bundle. I'd hate to be that person, so I wouldn't be the opposite person keeping a Bundle when they ordered just the game.