File complaints with the CFB & FTC..
Do consider maybe getting a call blocking device or phone.. You can google them and many are around $60.00 or so.
Report your callers 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/
By State DNC lists:
http://800notes.com/res/DoNotCall.aspx