At first I thought nothing of the mailing promoting moving services. Then I realized: "Hey, wait I’m not moving."
I called them up to see if an identity thief was trying to establish a phone number using my Social Security Number. It turned out they’d had no inquiries.
The rep validated me with the last 4 digits of my SSN, which of course is very weak authentication in this day and age. Then she informed me I could add a PIN to my account, which would be required in order to make account changes.
This is the second service in a week that’s offered me a PIN as another layer of identification.
I encourage you to look into setting up a PIN for phone-based customer support related to your utilities and other accounts. It’s an easy way to get a little more peace of mind.