Call from 972-393-6300 read U S Postal Svc 972-393-6300. When I answered saying "hello" several times no one said anything.

My husand received a call left on his cell phone from a Post Office customer service representative wanting to discuss products and services leaving a 800 number to call back for service.

My mother received a call from this number.  She said they told her she had a package they were trying to deliver and needed some information.  

Identified as US Postal Service asking about a business name I used many years ago. Asked if I was having service issues.

called twice in a row, no one there when answered. Annoying.  ID states US POSTAL SVC