Who called from 2013713447

Trying to find out who calls from this number.

Caller did not leave message.  Caller ID says it's coming from Teaneck NJ

when i call back it says the google subscriber you have called is not available.. no idea who this is.

I get one or two calls Daily from this number and the callers stay silent

Two or three calls a day and others. Goes to voice  mail. No message. All in all has taken up to 75% of my time allocation.  How do we stop them is the question!