Swing arm/Muffler Bracket Problem

[Inlinesicks]

I bought a 2011 Sunny 150cc a few weeks ago and on the first ride the rear tire went flat. I started taking it apart to change the rear tire and I am having a huge problem. I took the axle nut off and the bolts that hold the swing arm to the case but the swing arm won't slide off the axle. I can wiggle it back and forth a little but it will not slide off. I have tried a puller and pulled so hard that it broke the swing arm, so I welded it back together much stronger than the original welds and the puller broke it again. I have tried heat and hitting it with a hammer, nothing seems to work. Should I just cut it off the axle and get a new one or is there another way? Thanks.