It is Cablevision sales making the calls. I know someone in the NY office and here is what to do to stop the calls. Even though you may be on the National Do Not Call list, if you have or have had cablevision then they are allowed to call you.
Follow this:
In order for those calls to stop you would need to contact our "Do Not Call" number. The number is 1-888-425-2088. You then will be prompted to enter your telephone number and will hear a recorded confirmation message that your preferences will take effect within 30 days.