I was looking through my accounts online today and found the following: "MVQ*PRIVACYMATT 888" as an abbreviated description of a charge of $16.95 that had apparently been attached as a monthly charge to my account.
After doing a Google search, I discovered from the Complaints Board website that it was actually a bill from "Privacy Matters 123," and that their telephone number is 888-239-0316. I was told that I had actually signed up for the service when I purchased something on another site, and that I had been paying for several months. However, they were more than willing to refund me the money. Their non-plussed attitude made it seem to me that this was not something that came as a surprise to them, and unlike other places where trying to get money back is like wringing blood out of a stone, they were more than happy to say that they would refund me the money and cancel my service.
I will see in 4-7 business days whether this actually happened. If I don't see the money deposited in my account, I suppose I, too, will be writing to the BBB about this group.
UPDATE: I just checked my bank statement, and I did receive all the months of refunds that I asked for and was promised. So at least I don't have to follow up with this company, which was perhaps the easiest group to get a refund from.