Complaint Review: PublishAmerica

I Mary Belinda Graves Bruney published book with PulishAmerica in March of 2008. They( my books) were being sold over internet. I have gone to some of these sites and it clearly states that my books have SOLD OUT. Yet PublishAmerica keeps claiming they are not being paid for these sales. I am very confused, because I was under the impression that PublishAmerica only printed on demand. How could theye NOT be getting paid for my books being sold? I really need help looking farther into this situation. Any and all help would be greatly appreciated.                                                                           Mary Belinda Graves Bruney

                                                                                              Saint Charles,MO.63303