If I suspect an incoming call is said nuisance, I ready some loud music, usually The Contortionist, old school Opeth or BTBAM, and upon picking up if my suspicions are confirmed I ruin their earholes (or at least fuck up the recording and blast the robot) with beautiful music that is way, way too loud. I've done this tens of times over the past few months.
This month, I haven't received a single call that was a solicitor, troll fucker or otherwise. (I also just realized that the words "troll fucker" implies that they fuck trolls when in fact I am calling them a fucker who is also a troll but will leave that because it's also a nice insult if we were in Middle Earth)