OK, so we have confirmed that this item was sold by some random Marketplace seller, not Amazon. That changes things a bit. I still thought Marketplace orders were able to be returned free of charge but I'm willing to accept that I may be mistaken. I have only had one Marketplace deal go bad and it was resolved without issue nor cost. Perhaps I was lucky. Perhaps it depends on the seller.
If you must place Marketplace orders it wouldn't hurt to check the return policy first on those. Or better yet just stick with things sold by Amazon directly. I wouldn't blame Amazon.com if some random guy in his basement sends you the wrong item. I would however expect them to step up and make things right if the seller would not, and I still think they would if you gave them a chance. It probably would have been better to request a return&refund for wrong item rather than mentioning an exchange.
In your Amazon.com history it should clearly say that you ordered the black one rather than the pink one. Amazon & the seller will both be able to see this too. Did you check this? If the order history says pink then I can certainly see where the seller is coming from.
