That's the kind of thing i was interested in during my first few yrs out. However, as time goes on, antiwt activism became less interesting, now to the point that i don't care.
A phone call campaign would only reach a couple or a few people in bethel, and those are usually solid wt bots.
Thirdly, exjws are generally not very leadable/organisable.
However, don't let the lack of response chill your enthusiasm to do this yourself. Dial on!
S