"Rachel from Card Services" calls me at least twice a day. When I stay on the line and request they remove me from the list they hang up on me. I update my do not call list monthly. It doesn't help.
When I do get a call with a person I let them know that I am logging and recording the call and that in the event they call me back I will be following up with a law claim.
It's also important that when ever you enter or request something online or through the mail that you try not to give your number. Oftentimes that entry or inquiry negates the do not call list for you with that company. The number is sold to multiple callers and you are at square one again.
I never answer my land line unless I know who is calling or if I'm feeling feisty and want to mess with a solicitor. I feel for them....they are just trying to make a living but not enough for me to not enjoy givng them a hard time. 
Also you can frequently google the number and see which company is calling and read all the other complaints about their calls.
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