I’m confused

I ordered the e-book "Gamestorming" by David Gray but received the e-book "Getting Started with OPML" by Amy Bellinger instead.

I'd received a free e-book by attending the Boston No Show Conference via O'Reilly. I ordered "Gamestorming" by David Gray, but the book I received "Getting Started with OPML" by Amy Bellinger. Can I somehow exchange the book I received for the one I wanted?
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