Calling numbers back doesn't help matters, in fact can make them worse. Its bad because the numbers are spoofed as a ROT. You could be calling some innocent persons number or a innocent business that had nothing to do with the calls. While we understand that is is a frustrating thing, its just a bad idea.
Consider buying a call blocking device or phone. Many are around $50.00 and can block up to 1500 numbers. 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 u have a smart phone, there is a free app called call control. Iphones appear to have apps also.
Report your callers here:
By State DNC lists:
http://800notes.com/res/DoNotCall.aspx