I can't believe a grip can fail this badly

As unbelievable as this may sound, this grip is actually unusable. My issue is with the two pieces of adjustable plastic that come with the grip. Neither of the pieces fit the grip. After mutilating the pieces with a razor, I managed to get them to fit but not flush. I could either use the grip with an uncomfortable piece of plastic protruding on the grip OR use it without either piece leaving an uncomfortable cut-out space under the trigger guard. I threw it all in the trash; incredible waste of money