I called the number back on a different line and got a generic "This is customer service, enter your phone number to add it to our do-not-call list." type message.
This is a service for news papers to verify that your delivery service is going ok. They called us on behalf of the Houston Chronical. They are not a collection agency or a telemarketer. Still - it was annoying to get a phone call per day until I was finally home to answer and find out who it was.