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@Donut!
Using the vice is NOT the correct instillation technique, but should help in removing it.
It it's really stuck it might be rusted in which case you can try Plus-Gas, soak it overnight and it will help.
I had the same problem on an old Raleigh frame and ended up (after 3 bike shops and exhausting all my knowledge) going to a metal workshop. They welded a bar onto the BB cup and used that to lever the cup out.