Surface Pro 4 Bulging Battery / Screen. 3 1/2 years old.

So, like many others on this forum, we have a Surface Pro 4, in which the battery has decided to self-destruct, destroying a £1,700 machine.

The screen hasn't popped off, but the battery has swollen enough to prevent the hinge from opening as it should and for the glass on the front to be very distorted, and it registers random screen input, all the while running hotter than the central heating.

I've spoken to support. They unhelpfully told me that because my warranty is up, I would have to pay several hundred pounds (£333) to replace the machine with a refurbished unit. To me, this is completely unacceptable. These devices are clearly flawed by design. This issue is too wide spread for it to be a coincidence. The batteries used in these devices are obviously flawed, and when I suggested as such, Sean L, the person dealing with my case, stopped responding (A few days after that, I wrote to Microsoft's twitter support who confirmed that the case had been closed. Thanks Sean L.)

If the device is dangerous (as suggested by the agent who I spoke to on the phone in the first instance) and it does catch fire while we are away this summer, and it subsequently burns down a multi-million pound Cambridge University building? What then, Microsoft? You'll wish you'd just replaced it then, won't you.