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.

http://800notes.com/forum/ta-9f0ce767d8019be/a-different-spoofing-victim

http://consumerist.com/2014/03/18/florida-den ... y-telemarketer/

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

Federal:
https://www.ftccomplaintassistant.gov/#&panel1-1
https://esupport.fcc.gov/ccmsforms/form1088.action
https://complaints.donotcall.gov/complaint/complaintcheck.aspx?panel=2
http://www.consumerfinance.gov/complaint/
http://www.stopfraud.gov/report.html
http://www.fraud.org/

They hung up. I will block the number!

Called my cell phone at 9:50 PM. No message I thought there was a time limit on when robo calls could be made

Never left s message

Called my cell minute ago, answered but silence then ended the call.