Someone tried to call me from 202-870-5900 and did not leave a message. I called them back and got a recording that stated since this is a marketing research company the do not call list does not apply to them. The recording advised me to call 800-864-8601
and leave my phone number if I wanted to be added to their do not call list which I did. Was advised it will take up to three days to get my number excluded from their system.