Who called from 3012230057

3 calls from this number 301-223-0057 in an hour. No message and I didn't answer.

started  calling 9/9/08 never anyone there and n o name on ID

This is a debt collector--positive for sure.

Called at 8:09 am, September 11, 2008.  I didn't answer, and they did not leave a message.

Maritz Research is a legitimate research company.  I know.  I used to work for them.  If you wait long enough to talk with someone, they will respond to your request to take you off their list.  If for some reason this does not work for you, contact your local phone company.  Most have a process you can easily invoke to block specific numbers.