IPhone won't charge?

I've had my iPhone 6s for about a year now, and it won't charge. I've changed the wall outlet, tried three different chargers (all were expensive chargers) and it won't charge. What can I do? Also other day my battery went from 100 to 50 in like one

Is it legal for a school to take your phone overnight and then to their home?

The other day, my school took my phone after it went off in class. I took it to the office, and my school said my parent could pick it up after school or that it would be held overnight. My mom wouldn't have time to get it before school closed, so overnight was the only option. Fair enough, I already learned that it is legal for them to take my phone overnight. My concern is that once I was home, I looked on my moms Find My IPhone and I see that my phone isn't at school? I put the address into Google Earth and see that it's someone's house? That doesn't feel right…
Is this even legal?

HOW TO ADD MUSIC TO A SILENT VIDEO ON IPHONE FOR FREE? - 1

I make Instagram video edits and the app I use makes you buy the music to put in the video. I don't have the money to keep buying songs. Does anyone know of a website or free app that will let me add any song to a video without paying for the song or saying it is secured by Digital Rights Management?

Why won't certain albums transfer from iTunes onto my iPhone?

Most albums I can drag onto my phone without issues. But Gorillaz D-sides disk 1.disk 2 works fine)) and Best of Björk Wong work. It doesn't show each one being transferred like normal and when I open up my phone library on iTunes, they show up but are a lighter shade of grey and have this weird dotted circle on the left of them