They call daily and hang up on the machine, says Barnstable. Answered the other day to a recording telling me I have a call from I an inmate in Barnstable Correction Facility, heard a voice and I hung up.
You might want to research phone systems with call blocking capabilities or invest in a call blocking machine. My call blocking machine was less than $100 and can block 1200 numbers! (200 numbers are already pre-programmed, but that still leaves me 1,000 calls I can block). By the way, I'm up to 40 blocked numbers!