These people trying to play some kind of game. Any money you spend on legal wrangling is a complete waste of capital investment that you can't afford. They have deeper pockets, too; they are established, and acquired a $50K domain name that you couldn't afford.

Even if you could actually win, winning isn't worth it.

Get another domain, possibly change your name to match, and move on. Pick a name that doesn't have a $50K tag attached to the domain.

Also, does it absolutely have to be in the .com TLD?