Hi. In October, I purchased a refurbished iPhone 6 from MusicMagpie. I've always been pretty careful with it; it's never been water damaged and the screen is completely intact, with no major drops.
Recently it just suddenly stopped working, and wouldn't charge up. I sent it back to MM, as it was still within their 12 month warranty period.
They emailed today, saying that on inspection, there were no manufacturer's defects, and that the fault was 'clearly caused by accidental damage of some kind'. 
Well, that's news to me!
There was absolutely no further explanation given, and they're sending it back to me exactly how it was.
I'm really not satisfied with this outcome. How can they prove that it's accidental damage, when to my knowledge I never caused damage to the phone, and generally treated it carefully. What's to stop them from saying the same thing to any customer? 
Any advice? I really don't want to have to just suck this one up.
Thanks!