And just think, every single duplicate call is waeted time, money, and resources.
Only fractions of a cent, or they wouldn't do it. That's why you get all those calls from "Rachel with Cardholder Services" or "Jessica, with information about your health insurance needs." The sunk costs are so small that they only need one hit in a million to keep it up.
More importantly, have you rushed out to the Food Lion and stocked up on milk, bread, eggs, and frozen pizza?