You have a Note 7, but you want that sleek new Note 8. Samsung says: Send it to us, we'll give you a bit of cash, and you can apply that cash towards the purchase of our new, non-flammable device. That simple.
https://www.notebookcheck.net/Have-a-Note-7-Trade-it-in-for-a-big-discount-on-the-Note-8.244168.0.html