Cardholder services - Always is the last call if I don't take advantage of their offer but they keep calling even though only my answering machine answers.
Immediately manually blocked this number after I came home to find it on my caller id. I unplugged my answering machine so they don't reach anything, hopefully they will think there is no one home or it is an open line just ringing. Most numbers that reach that have not called back. I was once told by my local donotcall registry not to call them back, answer if you do not recognize the number or to press 1 or whatever number they want since that only alerts them to a live number and they wikll either continue to call or pass the numbers onto someone else. I have a call blocker device which can block entire area codes (which I have done) and up to 1, 200 numbers. I do both area codes and individual numbers.