I answered their call today - after ignoring their previous calls didn't stop them.  When I did, I was greeted by a computer that asked me to grab my Con-Ed bill and hold for a representative.  After a minute or so, a rep came on the line.  She provided her name and rep # and asked me to read the acct # from my bill.  I responded by nicely asking her to remove my # from their calling list.  She said she would do that and it will take 24 to 36 hours for it to become effective.  In the interim, she asked me to disregard any calls that I may receive.

I'll add an entry to this site after 36 hours have passed to let you all know whether my request was honored.