they keep calling, but i have no clue why

I received a call from this number and they are asking for a name that I've never heard of. They ask her to call them back immediately regarding her "case" and leave a case number. They wish her luck and state she will need it if she does not call them back.  Heavily accented man leaving message.  Not a good feeling to be receiving these calls.  I am not who they are searching for.

This number has called my extention at work and left a dark message for anotehr person.  The name of the person they leave message for is NOWHERE near my name which is clearly on my voicemail system.  They tell her a case # and that she needs to call back immediately. They then wish her luck and tell her she will need it if she does not call back.  Heavily accented Middle Eastern voice on message.

Not a good feeling to have that type message on my vmail.  I feel sorry for this person as she clearly has no idea they are leaving messages of this caliber.