I have occasionally ordered the 'free intro copy' of a magazine. If the bill comes before my 'free copy,' I write on the bill, "NO THANKS--CANCEL--NOT RECEIVED." I return that to them and think no more of it. Whether or not the magazine ever arrives after that, I do not subscribe. I find it more than annoying to be billed for a magazine before I have the opportunity to even see it.
As for the DVD, a couple of years ago some company, not F&P, sent out a quilting DVD that was not ordered. It stated clearly that it was not ordered and the receiver could keep it or return it without charge. If you paid for it, you would get a subscription to more DVDs. They sent out several bills, all of which I ignored. Eventually they stopped. I think if you do nothing, which is what you did to begin with, they will stop the practice if no one responds.