When people do call you, you gotta explain to them that you are on the do not call list. That should end the call pretty quick.

Yes, there are loopholes, for example, if you have a relationship with the company already they can call you. So your bank can call you and solicit a credit card. In that case, you might want to considder not having that relationship or at least complaining about their policy. But either way, whatever you do, don't do nothing, it just makes them think they can get away with it!