Just for clarification, do you have any kind of order history with this company?
It's entirely possible that a namesake of yours placed an order, someone tapped the name into the database and, lo and behold, up comes your address details.
Nevertheless, it does seem -odd- to despatch the goods without having first extracted payment from you. Have you made sure there is no trace of this purchase on your (or your wife's) PayPal account, credit card or bank account?
Other than that, I agree with ummmm; for misdelivered items, I think it's up to the retailer to arrange collection.