(I am calling a customer.)

Me: “May I speak to [customer's name] please?”

Woman: “He’s not here.”

Me: “This is [name], with [phone company]. I am calling to remind you that your phone bill was due on the 5th and is in danger of being disconnected. Can you tell me when you will be able to pay it?”

Woman: “How did you get this number? It’s unlisted!”

Me: “Ma’am, this is the phone company. We gave you this phone number.”