Calls my home number that is listed as a Do Not Call number; does NOT have any business with me that I know of; fails to leave a message, so I can't confirm if they have business with me; I NEVER return calls from numbers I don't recognize or that don't leave a message.
They are as good as confirming they are a scam artist when they don't leave a message and will be blocked as well as flagged as an identity thief.