I have a recording on a small digital recorder with the tones and message stating that the number is no longer in service that I play when I pick up. Then I add to my call-block.
Just got a call from 504-340-8445 while playing back voicemails. No one talked when I said "hello". I called the # back as I thought my screwy phone hung up on a customer. Message said phone # was disconnected or no longer in service.
Phoned my cell at 12:01. Missed the call and no message was left. I was expecting a call from an adjuster, so I phoned back at 12:14, and got the message, "this number is no longer in service." One can only hope that's true after reading the above messages.