I had something similar happen about a year ago and it was a really bad time. I purchased some hard drives from a third-party seller (claimed as new, seemed reasonable in price, but huge mistake in hindsight, I know), and they arrived fine. The problem was, the hard drives were not what I ordered, and were almost certainly used (scratched up a lot).

I requested a return, and had the seller provide me a shipping label, I sent them back, and never got my money back. The tracking showed that the package was delivered, but because the seller had provided me a label that didn't require a signature, Amazon said they wouldn't give me my money back, as the seller said they hadn't received the item.

At this point, I left the seller a review saying what had happened to me, and a few days later, I visited the seller's page, and noticed that my review was gone.

Not only does Amazon provide really shoddy support for people that have been scammed, they actually help protect the scammers in a way, by allowing sellers to remove a couple bad reviews from their page every month.