New Number
All phone numbers are recycled.  No one gets rid of a number without a good reason since it a pain in the butt to notify everyone.  So now you know why the former owners got rid of that number.

DNC Complaints:
https://complaints.donotcall.gov/complaint/complaintcheck.aspx

Also file a complaint with your State Attorney General's office.
List of State AG’s offices:  http://800notes.com/faq/attorney-general