AbeBooks service is unacceptable

I ordered a book from AbeBooks.uk on 26 April 2015 and paid 21.25 pounds by credit card. (Sales order number ***9, Purchase Order Number: ***, USPS tracking LN***US) The estimated delivery date they gave was 8 May 2015. It is now 9 July 2015. The book has not been delivered. After many inquiries where I had to directly contact the bookseller via the AbeBooks website, I was told that the book has been sent by Goodwill Workbooks in the United States and has left America on 01 May 2015. They said that once the book leaves the United States they have no control over it. Once in South Africa, it can be anywhere - LN tracking numbers are useless in South Africa. AbeBooks cannot do anything, the bookseller shrugs his shoulders and I am without a book and 21.35 pounds in my pocket. That is a shame! Well done for unacceptable service.