TODAY I HAVE RECEIVED 8 CALLS..  NO TALK...

I got 2 calls last night from this number and another one this afternoon (6/29). It lists as coming from Stanley, NC. When I call back only a generic messages answers, then the phone cuts off.  Any ideas on how to find out who the person is?

Called, asked if I was ? then hung up. They call me, take my time, and obviously if they offer any any product or service--I will opt out. How do I look up the source without signing up for a perpetual service?
Thanks

I get a call and answer and it hangs up. Or I check the missed calls, try to call back, and it rings once, then a mssage says "is not available", then it hangs up.

who is it?