another harassing sob that keeps calling; we don't pick up and they don't leave msg. understand from previous comments that it's scam or robot call. enough is enough. FCC: please do something to stop these unwanted calls.
Cancel your landline service. Use a smartphone instead. Use an online fax service if you need it. Always add all incoming and outgoing numbers to your phone contacts along with a person's name or a company name. When you get a call from a number that's not already in your contacts, don't answer it. If they leave a message, play it back and take it from there. If they don't leave an intelligible message, look the number up online. If it's a known spammer or you cannot otherwise identify it, block the number and add it to a contact named SPAM01. When SPAM02 has accumulated enough numbers, start SPAM02. Continue ad infinitum and never be bothered twice by the same unknown caller. If they expected a callback then they should have left a message. The age of the landline has come and gone. Enjoy the extra free time.