I wouldn't read too much into front line support for big companies. The people answering the ticket often don't have the ability to look too deeply into your issue. They're likely basing their response on the idea that Amazon processes should never allow them to upload the incorrect version of a file to their site, so the problem has to be the publisher.
But I'm with Pancake here, unless you have a specific reason to stick with Amazon here, you might see if they'll refund your purchase and just get it from somewhere else.