Tactics for gaining phone numbers

Are there any solid or “tried and true” tactics that people have come up with to get scammer numbers? I’ve been getting a lot of robocalls from spoofed numbers with my area code (one of which being a local business). One small caveat is that I’m not too good at this moment in time in social engineering like the gods some of you guys are. If I can get the toll-free numbers and post them, I’ll leave it to you guys as that’s not really my forte. Thanks for your suggestions in advance.