Consider getting a call blocking device or phone.. You can google them and many are around $40.00 or so. If its a cell phone, some already have call blocking, if not, there are free apps on the web that will work for some. You can google this. If you have a smart phone, there is a free app called call control. Iphones appear to have apps also. Another one is called Mr. Number.
I've been getting calls from this number for the past few weeks! They call at least 6-7 times a day! It starts at 7am and goes until after 10pm! I never answer calls from unknown! So glad I checked this site!