Not hacked, spoofed!  And yes, we do not encourage folks to call numbers back  because of the call spoofing and they may be using someones real number, even business's have this happen safely.

phone spoofing explanation
http://en.wikipedia.org/wiki/Spoofing_attack
http://www.fcc.gov/guides/caller-id-and-spoofing

http://consumerist.com/2014/03/18/florida-den ... y-telemarketer/
http://800notes.com/forum/ta-9f0ce767d8019be/a-different-spoofing-victim
http://www.foxnews.com/us/2014/07/26/colorado ... er-id-spoofing/

Report your callers here, not just to the DNC alone:
Federal:
https://www.ftccomplaintassistant.gov/#&panel1-1
https://consumercomplaints.fcc.gov/hc/en-us
https://complaints.donotcall.gov/complaint/complaintcheck.aspx?panel=2

By State DNC lists:
http://800notes.com/res/DoNotCall.aspx

FCC Abandoned Calls Complaint form:
http://www.huffingtonpost.com/entry/when-you- ... 4b08cd3359d61d0
http://www.fcc.gov/cgb/consumerfacts/1088D-R.pdf
email:  fccinfo@fcc.gov

To file complaints on Foreign company's and scams:
• Read up on it here:
http://800notes.com/forum/ta-d20d86fdc3e145c/reporting-international-scams
• https://www.econsumer.gov/#crnt
eConsumer.gov: Report Your Complaint
E-mail: econsumerwb@ftc.gov