There are some sites in New Jersey that are going around the "Do not Call Lists" and spamming cell phones. Most have 201 area codes.
If you want to block them from calling or any one else up to 10 numbers free do the following for Verizon:
Go to Verizon.com and log in to your account. Go to Usage Controls. On the left there is a box labeled "Spam Controls" Click on it and select your phone number(s). Type in the phone number you wish to block and hit Apply.
They only block them for 90 days, so if they start again you will have to repeat the process.
If you have a "Family Plan with shared numbers, and one party is over using their allotment, you can also designate when they get cut off so the other phones will still have mins left. (teenagers)