Who called from 4120000000

Received call at our business today from this number purporting to be University of Pittsburgh Medical Center verifying our company address and Benefits person.  They wanted email addresses and said name was Reshana from the Call Center.  I called UPMC and reported the call, and they said to give no information to the caller.

Get calls from this number about every three days.  Have never picked up and they have never left a message.  I assume it's spam.

i received two calls from this number today.  I was hung-up on both times they called.

Same as everyone else. Got a call from this number, answered, said hello, then their end hung up on me. So i'm guessing it is an auto-dialer calling multiple numbers at a time and the first to answer is who they are linking up with. Annoying as all get up though.

Got a phone call from this number, they played what sounded like classic rock for about 8 seconds and then hung up.