I understand your upset.... I know I was very upset. The surface pro 4 was known to have issues I remember reading about this online and replacements and or repairs were offered but this was about three years ago I think, I am not sure now. Microsoft apparently is not going to assist you unless you take them to small claims court and prove your unit was defective and make it public record.
Theire customer service and support is clearly from outside the USA and the representatives use normal USA names to throw us off but they all have an accent as well as a way of speaking which is not from the USA plus they provide little to no satisfactory assistant or help . I believe you would do much better taking your item to a local repair shop that is windows certified that is if you want to continue using the Pro 4. If not do what most Microsoft customers do toss it in the trash and buy a tablet from another company like Acer or Hp or better yet an Apple. It's sad many loyal Microsoft customers are leaving by the thousands and avoid their products but they dont seem to care. I guess they forget we have other choices. Whatever you choose to do I wish you the best and inform everyone friends, family and co-workers of your experience so they know what you went throw and not follow in your footsteps and buy anything from Microsoft.