dear sherri...
what you need to do is go back and read their submission guidelines carefully and see if that book is their normal payment procedure for 'hints'... it may well be...
if, however, it says such things are paid so much per word or per piece, then you can reasonably request an explanation for having been sent the book instead of a check...
i'm puzzled by the sequence you mention, though... did you send an unsolicited piece of work to them?... or did you query first?... did they send you any notice of acceptance?... and if so, didn't it specify what the payment would be and where your piece would be published [in mag or book]?... WAS your piece published in either one?...
read the fine print of their submission guidelines and if you still have questions, let me know how you came to send that piece to them... with answers to the above questions, i can give you more valid advice as to how to proceed...
love and hugs, maia