call came in, answered, no response.

Same thing for me. I answered and there was no response. This appears to be a crank who just wants to bother people.

I did today but did not answer since the Caller ID name was 'Not Available" and I never answer those.  It it was important a message would be left.  IMO it is either a charity or the credit card interest rate scammers.

Your post is not helpful, as you gave no information about the caller, purpose of the call, and you opinion of the call. While I can appreciate your being annoyed, and desire to vent, it would be helpful to others reading these post if information about the call and the purpose of the call was given.

Caller ID name was 'Not Available" pretty much says what most need to know since other replies indicate it's an unwanted telemarketer.. don't you think?