You can block even WITHOUT a smart phone. Consider a call blocker, which are available on Amazon for 4000-5000 CENTS. Look at previous posts to get an idea who you're dealing with. I'd say it's a worthless survey that helps callers figure out how to and what to spam you with, along with getting personal and maybe even financial information, too.
"Sundays are no longer sacred " Well, that is a case of "be careful what you wish for because you might just get it". At one time businesses were closed on Sundays in many states. Then the people insisted that stores and everything else should be open on Sunday. You might be too young to remember those days. If that is the case, then blame your parents for insisting that businesses should be open on Sunday.