My wife has rec'd 8 calls today by someone trying to pressure her for info, then tells her they are going to send her magazines for 5 dollars a week then hangs up. also getting texts to subscribe to daily messages

Caller keeps calling on my cell phone several times a day and leaves no message.  I do not answer because I don't recognize the number.  I'm on the do not call list for home phone and cell phone but I still keep getting unknown and unwanted calls on both.  How do you get them to stop?