Over and over and over again. Credit Card Services warning me that there is something urgent regarding my credit card. I have politely asked them to remove me from their calling list and they hang up.
It's too bad Verizon only allows us to block 5 numbers, andATT none unless you pay $7.95/mo. Comcast, on the other hand, offers unlimited blocking and it's quite easy. Dial *60, press 2, enter the number followed by the # sign and you're done.