Stoneforged Technology Inc

Ordered a PC from their website on January 11. The unit did not function properly since day one. They "cannot find the problem" (I gave them step-by-step instructions on how to replicate it). They refuse to refund or allow me to upgrade to a different unit. Since I suffer from ALS and am housebound, the PC is my primary communication and entertainment tool. Ideally I'd like a refund or upgrade (I'll pay the difference) so I can get a functioning unit.