It's 1 of 3 problems:
- The Phone
- The Charger
- The Electrical Outlet
It's a recent phone, and a bad electrical outlet would be odd, so I'm guessing it's the charger. However, if you want to prove it once and for all?
Go to your carrier's store (Verizon, AT&T, T-Mobile, etc...) and tell them your problem. Tell them you want to try out charging your phone with the chargers they sell for the Galaxy S7.
If the charger DOES work, either:
- Buy it there- problem solved, or
- Take a photo of the UPC, search on Amazon, buy it cheaper
If the charger DOES NOT work, then:
- The problem is your phone and the carrier should replace it
- Good thing you're already there!
Let us know how it goes!