"You have a wrong number. Goodbye."

It puzzles me when someone calls one of our accounts at work by accident, and instead of saying, "Sorry, I have the wrong number," the caller says, "Oh, well, what does your company do, then?"  I feel like responding, "What does it matter, if it's not the company you're looking for?  If you meant to order pizza, and you reach a hardware store instead, do you ask the proprietor of the hardware store to drop off some hammers?"