Same thing happened to me. They had my address, dob, and last 4 of my credit card. Thankfully the address was an old one and so was the card. I'm trying to figure out how to get a hold of them...anyone know how???
They are attempting to verify personal information. Do not confirm your address or give up your birthdate or anything else. Don't be intimidated by them telling you that you're being billed for magazines that you've already received. They're lying and trying to bully you.