It may be a scam by the vendor like the news link mentions. I recently had a bad vendor on Amazon and I was amazed to see many glowing reviews of their products and customer service. Suspiciously short reviews like, “great product”, that nobody legit ever bothers to make on a site like Amazon.
If it keeps happening, you can write “refused” with a marker on any unopened package and USPS will return it to it’s sender at no charge to you. I’m not sure about UPS’s policy, but I bet you could do something similar and drop it in one of their boxes or bring it to one of their storefronts. Or even call them and tell them to come back and get it.
Amazon is a perfect vehicle for this kind of scam since they have so many deliveries and will readily absorb the cost of mistakes.