I blocked them after the above call, and yet they still call. Apparently their system does not respond to the official Beep beep beep, "This number is disconnected..." message.
I got a call from this female robot voice that says "I am trying to reach <robot voice says a name>, it is very important that I reach <robot voice says the name again>". It gave me the option to punch #4 if the robot had the wrong number.
I blocked them after the above call, and yet they still call. Apparently their system does not respond to the official Beep beep beep, "This number is disconnected..." message.