Re-purchase an ibook

HI all,

I purchased an iBook but deleted it again as it was not available at that moment, it was to be released after two more weeks. Now I want to download the iBook. When I go to that page, to that book, it says download, but when i sign in to verify the purchase, then there is another message that I cannot download it as i have to purchase it. I wnat to buy the book but it doesnot have the option to buy it as it shows I have purchased it and I am not able to download it.

Really appreciate if some one can give me a solution for this problem.