If its spinning in place then as was mentioned its a failure from the glue and primer at the slug. Vise has corrected this by making new slugs with a groove in the bottom and the portion that attaches to the slug has portion that fills that groove to create a more secure slug.
To get it out, I normally take a flat blade screwdriver and rubber mallet and crack the bottom of the slug being careful not to break the Ball IT glued to the ball. If you break that you have to drill the whole thing out.