they never leave a message.

Spammer calls but won't answer their reported number and their voicemail "mailbox is full"

This is a new telescammer number.  My free robocall blocker quickly shut them down.

Caller id says Cox Tayrn.  Said our computer wasn't working.  Told him I just sold it last week.  He had the nerve to ask for the phone number of the person I sold it to.  Then called back two more times.  Sound foreign.

Possibly the only thing more annoying than a robo call is a caller who hangs up the moment you answer the phone. [grrr]