Options available when iphone 6 not working
IPhone 6+ not charging
Now it is out of charge and I can't do anything. It's just dead
iPhone 6 Plus
Sounds like you need help from Apple. Hopefully there's an Apple Store within reasonable distance. Otherwise, 800-275-2273 in the U.S.A. and I think Canada.
If you take it to a store, there is no charge. Make an appointment with the resident "Genius" before you go. If you call, you will likely be charged.