As you are buying directly from publisher, you should contact publisher for refund. It is the publishers who are responsible for providing support related to content itself as well as refunds.
The publisher’s contact information will be listed in your email purchase confirmation, as well as on your purchases page.
If you don’t hear back from the publisher, contact the us at firstname.lastname@example.org.
Customer Success team can be contacted regarding problems related to accessing content. We will handle any issues related with accessing or reading purchased content, such as finding My Purchases page, any technical problems on issuu.com or resetting passwords.