same issue here. 4 or 5 calls in the past 24 hours. no one there if i answer, they don't leave a voicemail and the number is not in service if i call back
774-233-6001 is a call center out of Holliston, MA. I kept getting calls too but most of the time either no one was there or it sounded like a recording. What I found out is that it is not a recording but live people advertising seminars. I interupted what I thought was a recording and the person talked to me. I told her I was on the do not call list and that at this point I considereds the calls harassment (2-3 times every day for several days) and I would turn them in to the Attorney General. The woman apologized and said she would take my number off the list. What is funny is that they were advertising local seminars and I live in Florida, not Massachusetts.