Comment by IIsi50MHz

The Federal Trade Commission seems relevant. I've not tested them on these "no support; no recourse" situations, but have had good results for other issues.

Anybody thinking of the "Better Business Bureau" should note that the BBB is not a government organisation and behaves more like a Better Extortion Bureau: paying members can keep their good rating by unilaterally declaring a claim has been resolved (often requiring claims to be reasserted multiple times), while non-members or non-paying members cannot even contest claims via the bureau.