It was United Healthcare that called our office, asking for someone who doesn't work here.
This call center is using an auto-dialer- there was a few-second delay after I answered before the call was connected. For those getting dropped calls (dead-air / hang ups) because of this, know that it is illegal for the call center to drop more than 3% of its calls to you. http://www.fcc.gov/cgb/consumerfacts/tcpa.html