Get a bigger hammer!
I removed mine using a socket (same size as the bushing) on top of it and tapped it out using the a dead blow hammer. They will come out, they are simply tighter then shat. Once it starts to push out, flip the whole thing over and rest it on the socket and tap the shaft portion of the sway bar link, it will push it right out. Use a rubber mallet or a plastic dead blow hammer.