maybe try a heat gun or blow dyer to heat up the bottom bracket shell a bit, then try knocking the bearings out.
u can also use some penetrating lube between the bb shell and outter bearing race...let it sit for some time to do its job, then try to knock em out. however, if ya get the lube inside the bearing itself, u may have to take the seals off, clean the bearings out real good and then re-pack em with fresh grease.