Microsoft Refuses to Replace THEIR PROBLEM!!!

Microsoft is refusing to replace my Surface Pro 4 THAT THEY SENT ME. Long story short, I received a "new" (actually refurbed) Surface Pro 4 from them in December 2017 due to my first device being a lemon. Lo and behold, I'm now the latest victim of Flickergate. My screen is scrambled so bad it's become unusable.

I followed all of the instructions Microsoft gave regarding the potential solves to this issue, and then subsequently called Microsoft Support to set up my replacement process. THEY REFUSED TO REPLACE IT. Their only solution was that I pay $599 to "extend my warranty" and then they'll send me another device. UNACCEPTABLE! I was escalated to a supervisor who STILL REFUSED TO REPLACE IT. Again, this is a device SENT TO ME BY MICROSOFT. Not even one that I purchased, but what they chose to give me after their first failure. So can someone explain to me why I'm supposed to assume responsibility for a known hardware issue that isn't my fault?

We're in the midst of a nationwide quarantine, relegated to doing all work from our devices, and mine has become unusable. And while I thought I could actually get some relief during this crisis, Microsoft is refusing to own up to their mistake. WHY WON'T MICROSOFT EVER ACCEPT RESPONSIBILITY FOR THEIR PROBLEMS???