Get a few calls each week. I keep opting out and it doesn't work so I called them to complain and the man that eventually answered asked me for my name I said no and started to state my problem, he rudley said goodbye and hung up. Now it will not let me talk to anyone.
If you got a robocall (a recording played when you answered the phone), you don't need to be on the do-not-call list. It's simply illegal and you can file a complaint immediately; see the complaint page at donotcall.gov.