Received call from number, didn't answer it because I didn't hear the phone.  When I looked at my caller ID, I didn't recognize the # and there was no message left.

Keeps calling did not answer and they did not leave message. Calls at 8PM, Called agin while writing this when I answered there was dead air so I hung up.

CALLS AND IT SAYS INVALID KEY THEN I CALL BACK AND IT SENDS YOU TO A VERIZON PROMPT

I am on the Do Not Call Lists - Same number called me on 2 lines in house offering discount carpet cleaning - I scheduled an appointment for the vacant lot around the corner.

Did you get the name of the company?