Oil Filter Frozen

Alright heres the issue, i just bought a 73 Scamp, /6 225, last time it was registered was 2000 which leads me to believe the oil hasn't been changed since then. But anyway the issue come to the fact that the oil filter seems to be frozen on the stem. I have bent / broken two strap wrenches trying to get the oil filter off, in turn crushing the can a slight bit. I then tried driving a small spike through the core of the filter and prying off the frame, which does nothing to loosen it and in fact started ripping the filter. Any other ideas on how to get this filter off would be greatly appreciated?!