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@Francois Driesen - An epub is a regular zip file with a different file extension - .epub, instead of .zip. The first step in processing an epub file is to unzip it
All I can suggest is to copy the .epub file to your desktop, rename it to .zip and try opening it with your unarchiver. If that gets an error google for "repair zip file' and try to repair it.
If you do manage to repair it, then rename it to something like 'repaired book.epub' and try reading it with the calibre ebook-reader program.
If you can't repair it then ask for your money back or replacement epub.
BR
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