Had a missed call from this number (978-456-4752) they didn't leave a message, but despite being on the state/federal Do not call list, I get so many spam calls that I just don't answer unless I know the number. When I tried to call back it's a busy/disconnected signal and then called back right away and was only greeted with a "Please press 9 to be added to our Do Not Call list" I've done that.
This number just called and didn't leave a message. I called back and got a busy signal, called back again and received an immediate prompt asking me to press '9' to be on their Do Not Call List. No mention of who the owner of this number is.