I'd be inclined to post a carefully worded video review that clearly shows your issues and beefs with your purchase and list off your experience trying to correct the defects. People might want to know, PM might want to know. Keep it friendly and don't burn the bridge, but be up front about why you are unhappy. Make sure your communication is clear and try to get a resolution again. Something must not be getting through if you feel abandoned in your efforts to just break even on what you've spent for your brand new machine.