Sometimes they don't even bother having you sign up. I had a bottle of this crap show up in my mailbox about a year ago indicating that I had two weeks to cancel my subscription before they started charging me. However, I had never even heard of them before, and I certainly didn't order them.
I changed my credit card numbers, just in case they had somehow hijacked the numbers from an online store. (I know I could have disputed any charges, but it's easier to avoid them in the first place, as far as I'm concerned.) Just for kicks, I went to a public phone to call them and see what kind of scam they were running. When I called them, the automated system said to enter your 16-digit credit card number to reference your order. /facepalm At this point, I figured it was time to get the authorities involved.
I contacted the California Attorney General's office, and they have apparently seen a spike in this sort of scam. I wrote a letter back to the company telling them to fsck off with a copy of the letters and responses from the Attorney General's office. Thankfully, I've had no further contact.
