@L.K.D.
Check with your provider. My service provider is Optimum. They allow you to block up to 32 #'s. Not nearly enough, but better than nothing. You just set up an online account. Blocking is only many features offered.
There are Panasonic and other phones that will block up to 250 #'s. Amazon and eBay offer many more inexpensive yet sophisticated devices that block up to 1500 #'s and entire area codes. Just search call blocker.
There is software you can get for your computer to block calls too.
Lastly look at nomorobo.com to see if it's right for you.

How do you block the number?  They call my business # at least 3 times a day.

Called on 08/02/2013 @ 11:50 AM from Shoreham, NY. Caller ID shows Rocky Point which is next to Shoreham.

Also got calls from (631) 209-6030. Just blocked both #'s.
Booth are the same Google scam.

Called on 05/22/2013 at 12:02 PM from Rocky Point, Shoreham, NY. Caller ID shows Rocky Point. No message was left this time. Got a call from this caller back on 02//27/13. It's a Google scammer.
I got a 2nd Google scam call this morning from Scranton, PA. These Google scammers come from all over the country and a becoming a daily nuisance.

Caller left no message. I *67'ed the # and got a recording. They want to get me on Google's, Yahoo's and Bing's websites. Better hurry as the sites are filling up. So the Internet is filling up? I get these calls constantly as does everyone else. Do I really care about being listed on these websites,? NO!
If you were legitimate, your business name would show up on caller ID, not the town your calling from you idiot! You would also have a business name on your recording. I guess your hiding for some reason.
Caller was from the Rocky Point, Shoreham area of Long Island, NY.