Received a couple calls from these folks, unfortunately later in the evening (approaching 9pm). No one says anything, though; they call, we answer in the hopes of asking them not to call, no one says anything and the call ends.
Caller ID shows as 8012149297 (a phone number tied to Venture Data; see http://800notes.com/Phone.aspx/1-801-214-9297). A post from this thread also indicates it's Venture Data.
As they are not telemarketers, they are not bound by the National Do Not Call Registry. Their website does indicate, though, if you request your number to be removed from their internal (company) call list, you can enter it and any calls will stop within 72 hours.
Go here: https://www.venturedata.com/NoCallList.htm
answered said they were conducting a survey on education and it would take 15 minutes. I asked why they are calling on my cell and was told it is a computer generated call. Told them I'm on do no call list and they better remove my number.