DO NOT JUST SAY: Put me on your do not call list
WHY? Its a call center with multiple programs...they will only be obligated to put you on the program's DoNotCall list.
DO ASK FOR THE NAME OF THE CALL CENTER: They will most likely try to again tell you the name of the program they are calling on behalf of. Do not be fooled, continue insisting on receiving the name of the physical calling center they are calling within(if you must, get to the supervisor). Once they name the physical calling center and you request to be put on the DoNotCall list, by law, they are required to remove your name from all program calling lists they handle. Much more effective.

Hope this helps...