>I didn't order a package from Amazon, but it was shipped from the company to me via amazon.

Are you sure about that?

It sounds like you bought from an arbitrager: someone who's just a middleman, posts something for sale which they don't even have, but at a higher price than some retailer that does. Then, when you buy it, they go buy the thing (on Amazon in this case), use your address as the delivery address, and then pocket the difference. It's extremely common on Ebay and Amazon both, and many other places.