There may be some wisdom in contacting the BBB or a law firm, not to file a complaint or a lawsuit, but to get advice about what actions you could take. Then, you could threaten WidowPC with the recommended actions and possibly get them to do something worthwhile without officially taking legal action. And if it doesn't work, you could then consider the merits of actually taking said action.

And there's always the option of asking Ben to look at the laptop. I suspect he'd do a better job of identifying the root problem than WidowPC has, and if he doesn't actually change anything, then the warranty should not be affected. (Assuming you even care about the warranty by this point...)