Simply hang up if they call you.  See if you can get your employer to install a call blocker.  Do not engage in conversation with them. They tend to pick on people they think are vulnerable. WOmen, single mothers, the elderly and members of the immigrant community.  Also anyone theythink might have been in financial difficulties at some point in the past.  Absolutely  do not return the call or talk to them.  This is an absolute scam.

I received a call from this #,  l have not returned the call,