What is the most logical next event?

How to block robocalls
Don't accept the call.
First of all, if you're getting a call from an unknown number that you suspect may be an automated message, don't answer it. Though these calls are dispatched via computer, there are often attendants on the other end checking to see whether the calls went through.

Choose from:
(A). Even if you don't answer the call and the automated message remains, decline the call before trying again. The automated voicemail message will require you to enter your account information before beginning the call..
(B). When the automated message sends a notification that calls went through, simply disregard it. Robocalls will most likely restart automatically, so go ahead and cancel them before proceeding..
(C). These callers will never have contact with you and can either reject you or simply ignore you. It's a good idea to leave voicemails with automated messages instead..
(D). If they know that the calls are being answered, it will just make them more persistent. You can usually tell a robocall from a normal unknown number by looking for lengthy or unfamiliar extensions..
(D).