Who called from 3125770024

I received a call from this number this morning.  Caller left no message.   When I try to call back, I receive an error message.

I picked up the call but put my phone on mute. An operator comes on and asks for me, but again, Im on mute. I just wanted to see if I could hear what company it might be. No luck. She just sat there and then hung up.

Receiving a couple of calls per day from 312-577-0024.  Cannot talk to anyone.

When I ansewr the phone, I get a recording that says "press 2 to talk to an operator"

When I press 2, I get a message that says "the remote party has disconnected the call".

If I call the number back, it does not go through.

Some sort of robot call that is annoying.

It directs to a voicemail box after I pick up. So far, they called me twice.