Report these fuckers to the FTC. Just takes a minute. You can do so even if your number is not on the do not call list since they are using a recorded message:
"1. You may file a complaint if you received an unwanted call after your number was on the National Registry for 31 days.
2. You may also file a complaint
if you received a call that used a recorded message instead of a live person (whether or not your number was on the Registry). "
https://complaints.donotcall.gov/complaint/complaintcheck.aspx