Amazon mismatched description

I have ordered something from Amazon (listed from a third party seller).

I've had an e-mail from the seller but the product codes don't seem to match.

If I type in the code from the e-mail directly on their own web-site it comes up with an inferior product.

I purchased the item in good faith but I'm concerned that when the item arrives it will be the inferior model.

What are my rights? Who do I take this up with, Amazon or the third party seller?