[KathyJM]

I purchased 4 ebooks from Kobo (all the same author/series). I downloaded them (direct from their website, I don't use their Kobo desktop). 3 of the 4 appear to be corrupt/faulty. Each page displays only 1 or 2 lines (at the top and bottom of the page) making reading very frustrating.
This happens whether I try to read via Calibre on my laptop, on my Kobo reader, or my Android tablet.

I contacted Kobo, who said I should repair the account from the reader and with the desktop app. I did this as they instructed, to no avail.

i them downloaded ADE onto a totally separate PC and downloaded the books from my account again, the result was the same fault.

Any suggestions as to a fix? I have asked for a refund but Kobo are ignoring that question ...