iPhone 6 is completley dead and unresponsive

I woke up today to my charging iphone not responding at all. I've literally tried everything - connecting it to the computer (but iTunes doesn't see it at all), I've tried rebooting it, force starting it, factory reseting it - NOTHING! It wont vibrate, won't make any noises, won't do anything. I'm at a complete loss because I'm abroad and can't really do anything - there are no repair shops or apple stores where I am at all. I need my phone for work purposes. It's a new iPhone, not even 1 year old, and I've never had it repaired before. I bought it from the official Apple store.

Please, someone, help! I have no idea what else I can try to do 😟