Well, you could write to your state attorney general. Nitro Support tells me that they have a flat no-refund policy, but in Washington State that's actually illegal; the Washington State RCW has a definition of "Implied warranty" which cannot be escaped via T&C, warranting any produce be "fit for the ordinary purposes for which such goods are used."
The Nitro T&C do state, " Unless otherwise provided by law", but they've been pretty unyielding. Still, I suspect filing a BBB and a State Attorney General complaint would get their attention.
The flip side is, this really wasn't a very expensive product. Yes, the company is losing good will, but how much time would you spend fighting it?