Where Is My Refund?

I received an e-mail about a refund that has been issued to me because you don't have the book I ordered; however, I still haven't received my refund. I am in desperate need of my $48.40 plus the $1.00 additional charge so that I can buy the book somewhere before my class starts. I purchased the book Monday, and was notified of the refund Tuesday. Please let me know when the funds will be deposited back into my account. It has already been three days since I made the purchase and two days since I was notified of the refund.