Nobody should be using the Galaxy Note 7. The line is done, no more will be produced, and Samsung wants you to return the phone to your point of purchase.
That last part is the tricky bit. You can't just ship back any phone to Samsung and expect a refund. You need to talk to the carrier or store you got it from. Be aware that all the retailers below say they have waived restocking and exchange fees, so if a clueless retail drone tries to charge you one, stand firm and demand to speak to their boss.
Here are the policies we've found so far:
Want to know what to get instead? Check out our list of Galaxy Note 7 alternatives. Some of the best aren't sold directly through carriers, so you may want to get a refund rather than an exchange in those cases.