Received a call from this number on my home phone, which has been on the "Do Not Call" list for years. I do not answer any calls outside my area code that are not known family or friends. No message left.
Since they are a data gathering only company they are not legally required to stick to the do not call list. I found the above address to have numbers added to their internal do not call. Don't know if it will work or just a scam to get numbers.