This is an easy, half hour, repair. File the once flat flats flat again. Do your best to get the reflatted flats parallel to one another. Use a 12" or 15" adjustable wrench for torque. Then get a big bolt (I used a 5/8" coarse thread bolt, nut and appropriate washers). Feed the big bolt into a washer, then into the non-drive side of the cup and through the cup on the other side. Fit the adjustable, snug the bolt nut finger tight and washer up against the wrench and bob's your uncle - almost. Of all the stuck bb cups, this method has failed me only once. Bonne chance...
And for everyone who might run into the tight cup syndrome, always always start with the big bolt procedure or you just might be the next guy or gal to screw up the flats. Trust me on this.