I highly recommend downloading a call blocker app for your phone if you can. The one I have allows me to block all calls that aren't from my contacts, and I can set the app to either send them straight to voicemail or just straight up block them entirely. I only had to use that second option once and only for a week or two, but ever since then I went from multiple scam calls a day to maybe one or two a month according to the list of blocked calls. Even after letting numbers not in my contacts through to voicemail the number of robocalls I'd get kept falling.