you can take a mallet and hit it a few times... to break it, but you risk stripping the wheel stud this way also.. you can find a slightly larger size allen bit and whack that in the lug until its tight enough for you to break it loose, or just simply go to tread quarters so they can pull it off and they will be liable if the wheel stud gets stripped ... no cost to you..... all in all, take it back.