This may help - call the following number from your cell phone: 888-382-1222.
It is the National DO NOT CALL list It will only take a minute of your time.. It blocks your number for five (5) years. You must call from the cell phone number you want to have blocked. You cannot call from a different phone number.
also per Verizon, text (stop) in reply to tele-text and it will be noted and charges will be removed .