I have signed up to the DNC list. I have also used some call blockers since years ago. However, I think it's not completely stop these robocalls. They are never getting tired of trying to harass our privacy life. Now I choose to just ignore those calls. I have also read an article that might be useful for anyone who get multiple robocalls, especially from legit businesses at
https://www.whycall.me/news/consumer-wins-massive-229500-rob.... Hope this helps.