Also file a complaint with your State Attorney General's office.
List of State AG’s offices: http://800notes.com/faq/attorney-general
What the Do Not Call lists covers and doesn’t cover and why: https://www.consumer.ftc.gov/articles/0108-national-do-not-call-registry
Call Blocker
You need to buy a standalone call blocker, call blocking phone, use your carrier’s call blocker if they offer one, or download a free call blocking app for smart phones. For conventional cell phones, assign the number a letter like “z” and make no ring. You may also need to have your carrier increase the ring time to avoid having them leave a message on your voice mail.