I started doing the same a few weeks ago. It could be a coincidence but the number of calls seems to decrease. Not that I was getting a lot but now I go for many days without any at all. I just get to the life person and put the phone on mute. As far as my disruption goes it's about the same but I imagine the scammer's cost raises manyfold: they pay a lot more for the time on the line and their operators get disrupted on top of that. If I get a call to last a minute vs 3 seconds it takes to hang up it already makes my number an order of magnitude more expensive to call vs. a number that hangs up/does not answer.