Verizon Wireless: I've used the website feature before to block numbers. I just found out, though, that they expire after 90 days. You might want to go back and check if you haven't added any numbers in a while.
I received call today (6-15-11) from above number and I pressed 1 to have my rates lowered...a woman answered and asked how much dept I owed?...and I told her between 500-1000...she said I was fine and to disregard the call and hung up. I called the number back and received a recording that this number has been disconnected.