I have bought two different ebooks from Sony which had a problem with the font size not being changeable - I was stuck with only a very large size font. I reported both books to Sony using a "contact us" link on the Sony store website. One book got fixed within a couple days. The other one took longer, and Sony refunded my purchase price. In both cases, once the books were fixed, I got an email notification from Sony and I was able to download the corrected books.
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