cablevision misleading advertising lakewood, New Jersey

Cablevision advertise $9.95 upgrade to silver package for existing customers ,however when i called for the upgrade was told that i could not get it because i was in a different promotion and if i wanted it i would be charged $23 .00 ,they never stated this on their commercial,they discriminate at will against their customers ,i realize that they have their rules however they  should clearly state this fact ,i feel that they are dishonest with their ads ,my only saving  grace is that soon verizon fios will be  availible in my area and watch how quickly i switch .