I had gotten a few calls from some scammers on the phone offering to lower my credit interest rates or something like that. I started getting put through to a representative and told them to take me off their list, at which point they would usually hang up. They kept calling so I kept getting put through to them and started cussing them out, trying to give them a hard time. After I started doing this the calls became more and more frequent. They would cuss back and say the most ridiculous things, like an 8 year old talking trash on Call of Duty. Finally I found out when one of the scammers let it slip that he gets paid to keep me on the phone as long as possible. They won’t take you off their list. But if they find out your a person who they can get some time on the phone with, they will call you A LOT more frequently.
TL;DR: Scam callers get paid to keep you on the phone. Even if it’s just a shouting match. So don’t pick up.