This happened to me today, I ordered Apeface and I got Siege Optimus. It was clearly an item from a third-party seller with an Apeface sticker/barcode on the box (either genuine mistake or something dodgy). Contact Amazon, say that you ordered this but they sent that, and ask for return and replace. They will reply that since it is from Amazon US, they cannot order a replacement and will refund you the full amount. I was allowed to keep the item.
So I got a full return and will be selling the Siege Optimus soon :D.