Depends on which Christmas you got it for; the one 3 weeks ago or a year and 3 weeks ago.
If it was the one just past, I would explain to the gift-giver what happened and find out where they purchased it. You may be able to exchange it locally and over-the-counter.
If it was purchased on-line or not at a store near you, you can still contact SanDisk Tech Support (calling is by far the best way) and they can arrange to have a replacement unit sent to you. If you live in the US, they normally pay the return shipping on the defective one too via a downloadable pre-paid shipping label you just print out and attach to the package. Then just drop it off at your nearest UPS store and it’s on it’s way.
