I know when the situation happened, and I know exactly what happened - but now I'm furious because this is still going on.
First, I own up to this mistake: I misdialed a phone number to pay a bill, and accidentally gave my credit card information to a third party thinking I was paying a bill (the third party never corrected me when I asked if they were my billing agency - of course they said yes). But once I found several fraudulent charges on my bank account I canceled my credit card and called the places who charged me to cancel their services.
However, three months later, I've suddenly begun receiving a magazine I did not order. I checked the subscription office of the magazine and low and behold, I "owe" $75 for a five-year magazine subscription I never ordered. When I contacted the magazine directly, I discovered the subscription was ordered through - you guessed it - Subco.
My guess is one of Subco's third party vendors is illegally sending credit card numbers to order magazines so they can receive some kind of financial bonus. It has to stop. Subco, check your vendor lists. This is an unacceptible process. I have the phone number of the service who scammed me, however, so I can provide proof of the scam.