so is this some kind of scam

I got the exact same message today.  Said his name was Thomas Delaney.  It came up as a restricted number so I answered it...big mistake!! I then hung up on him and he called right back and left the exact same message you posted and left a number to call him back at which was 262-509-0277

Someone named Sarah Martell calls from an unknown number, says she is a Private Licensed Courier saying that I am a defendent and she filed a complaint that requires my signature and she will be dispatched to my home and place of business and I need to call this number to place a stop order on her services: 262-509-0277.  And she says "I've been notified".