Check out this new App called BLOC. It’s available in the USA, Germany and Switzerland and holds thousands of numbers of this category (robocalls, scam calls, survey calls and health insurance broker calls). This saves you time for more important things in life and keeps you free from such calls at work or at home.
You don’t need Internet access nor to register to use BLOC. Your personal data is encrypted and you remain anonymous.
More information in German you can find here: https://www.bloc-app.ch
Have fun with BLOC!