This is a head stumper!

I purchased a book last month, and now I am unable to open or read the book. It says "this book cannot be opened with the current apple id". So, maybe I used the wrong apple id...well, I only have one, so, that isn't it. If I delete the book from my ibooks library on my mac, it shows up as purchase available in icloud. So, I redownloaded it and, yes, the same thing...cannot open/read, same error/problem. I even checked the well-hidden ibooks.plist file in my home library folder and it shows this book was purchased with my apple id (hense showing up as one of my already purchased books). So, called apple support of course and they reimbursed me the for the purchase and suggested repurchasing it. That sounds like a good idea but how do you repurchase something that shows already purchased in the ibookstore? There is just a download button...no purchase button? Told you it was a head stumper. Any ideas?