Or you can adopt my philosophy-I don't care about the dollar value of any given figure, only whether I enjoy it. But I don't say that, to knock you for worrying about it. And I would certainly expect a vendor to provide an undamaged good on order.
Having said that, in general, if you wanted to fix that kind of a break, cyano-acrylic glue will work (CA glue, one commercial formula is Krazy Glue, but your better off getting a formula made for modelers), but you'll improve the repair by pinning the join, if at all possible.
Pinning consists of drilling a hole in the two pieces at the point where the break occurred, and inserting a piece of wire or rod. This strengthens the joint, because it increases the gluing surface, and for our figures, the pinning material is usually stronger than the white metal alloys used to cast the figure.
Even for a piece as delicate as a plume in 54mm, where you might not be able to drill a hole in the material, I would make a notch in it, that would fit over a piece of wire or rod, because that would still be stronger than a simple butt join.
I have also tried a tip I got one time, to wrap the piece with a piece of facial tissue and soak it with CA glue. I tried that with a broken bayonet on a 54mm musket. It didn't look as nice, because the surface was still a little fuzzy.
Soldering would also work, but as Scott noted, it takes some practice to do it right. I only solder figures to bases, using pegs cast in the figures' feet, and not for anything else yet. I'm not confident enough with the technique.
Once the joint is repaired, you can touch up the paint.
As I noted above, this all occurs once you've decided whether to repair, or return the item.
Hope that helps, prost!
Brad