If had to do it again, I'd write a subtly provocative letter about all the things that are wrong with WBTS, and post it to only one person at a time, in order of how much I cared about them. Wouldn't sign it. It would take a while for it to find somebody who had the brass to talk to the elders about it, and if they came knocking I'd stall until I was bored with wasting their time and then write on a postit note or a used envelope or maybe a pizza carton
"Dear cult,
You're dropped. Don't call me."
Actually..... definitely the pizza carton; it would be a bitch to store it in the congregation files (how about that stale pizza smell in the hall for all eternity?).