I did not order these 2 books & would like my money back???

I think this is a scam, I was away when I came home & thought I had ordered something & after opening the box, no I had not ordered them at all.
I would like my money back but there is no address on the invoice, I have my account #no - I was dumb & mailed a check for the $27.40, the book are awful nothing for me at all in them for me.