Siegel Marketing Group-
They war-dial phone numbers to put together list for other telemarketers. If your number picks up {human or voicemail}, they put your number on the list and sell it.

Reporting to DNC is fairly useless since that relays to your state's attorney, most  of whom have no interest or are swayed by lobbyist groups..

Report them to the FTC:
https://esupport.fcc.gov/ccmsforms/form1088.action