I just block all unscheduled calls and calls from unknown numbers. If there isn't a calendar event and it isn't coming from a known family member or close friend, the call doesn't go through.

I also have multiple cell and virtual numbers and give different ones out to businesses, banks, friends, and family. Businesses that don't need to ship me stuff also get a different address than ones that do.

I don't register to vote anymore because they leak my residential info. When they can agree to stop leaking it, I will participate again.