First of all, I have to mention that I was a great fan of my Surface Book, until a few monts ago.
8 months ago, the HW warranty of my surface book ran out. Over the last 3-4 months, my surface book display bulged more and more, the glass of the screen disconnected from the edge, the frame is bent..
And I was not even using it as tablet. It was mostly connected to the docking station.
I would keep bugging MS support to get the case moved beyond the level 1 techs, there are several forum posts of people doing this and getting the device switched over (Although they were US based). Outside of that i personally don't think spending 600 chf to get an out of warranty device that cost 3000 originally replaced is totally beyond reason