Blasted Miche Primato

you could try clamping the outside of the cup to a bench-vice and try rotating the bike.
Or drilling out the axel & using a jigsaw to cut the stuck shell (you will probably need to re-thread as this method will destroy some threads)

Regardless of the bashing that Miche BB's have had on this forum I managed to get a pretty good chainline on the missus bike even after mashing the thread slightly..... put the tool down have a breather and get back to it, it's not as tough. Hope this reads well without sounding patronising, just the way it worked for me.