Report them here:
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/

Also consider buying a call blocker device or phone. Devices hold more numbers then phones do though and can be cheaper. Amazon has a nice selection of both .
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=call+blockers