Xlibris publishing E-Books royalty of over six months reported on Amazon E-books, but failed to be reported and not paid by Xlibris. Philadelphia, Pennsylvania

I have just published a book with Xlibris. The book is listed as E-Book. I looked on Amazon e-book, and the book is ranked top 100 paid on Amazon e-book for over  a month. The book is still in good rank on Amazon e-book. The unfortunate thing is that for over nine months since the book has been released, Xlibris has not acknowledge any royalty in myn account on the book. They just keep telling me that they have not recieved any data report from Amazon E-book.

I wish if Xlibris would clarify if  the book is really part of the top 100, or part of the numbers of paid books on e-book, or paper back market in Amazon.com. Also, I wish they request Amazon company to clarify the validity of the reported data online, and pay me the required royalty due for this sales rank.