Conversation With A Phone Company

Phone company: To make your suggested change, we need your PIN first

Me: I don't know that I have a PIN, though since we opened the account 18 years ago I may have forgotten.

PC:  We only started using them about 5 years ago

Me:  I don't remember being asked to set a PIN 5 years ago

PC: No, you probably would not have.  On old accounts they were simply assigned by computer

Me: So I can't possibly know what it is.

PC:.... I need your PIN before I can process the change your have requested