Who called from 2176662720

I keep getting calls from this number but no one talks I say hello twice and they hang up.

number keeps calling but when I answer no one says anything and they don't leave a voicemail.

When answered they ask for personal information without identifying who they work for then try to tell me things about me and my accounts

This number keeps calling my phone and never leaves a voice mail.

I answered to hear a recording (after a short pause) saying, "Hi, I'm Amy - an employment specialist..." and then a loud busy signal.  I've been getting the exact same thing from many other numbers.  MAKE IT STOP!!!