Oct 23, 2013
You might also want to file a complaint with the State Attorney General. Otherwise send them a cease & desist letter via US mail. You can find templates online. A honest collection agency will give you their legal mailing address BTW..
https://www.ftccomplaintassistant.gov/#&panel1-1
https://esupport.fcc.gov/ccmsforms/form1088.action
https://complaints.donotcall.gov/complaint/complaintcheck.aspx?panel=2