Who called from 7185573000

this is the SS office, they were calling to help with my application

The SS Office doesn't call you.  They correspond only by mail.  When I called the number back I got a message saying that the number couldn't be reached.

I did not answer. When I called it back it said it was a non working number so it's not the SS office

This is a legitimate call. I had applied for SS and they had additional questions.