You can get the damaged cup out with a couple methods. One of them is to try to crack it the rest of the way off, but the way I would try is to cut it. You have to be careful to make it work though.
Take a Hacksaw blade and cut the cup from the inside out working from the axle hole. You will not want to or be able to cut the whole way through because the threads can be damaged in the frame. Once you get most of the way through, take a large flat-blade screwdriver and a hammer and chip it through the cut or cuts. Once cracked, hit the portions remaining with the screwdriver and hammer and it should crack out the rest of the way. If It doesn't, establish more slot as needed and try to rotate(unscrewing) it.