Just say NO! And STOP giving talks, period.
JW's: The only Organization that requires you to ask "permission" to step down from "voluntary", non-paid positions and responsibilities. Ummmm...NO! You owe these people NOTHING! Zilch. Zero. Stop doing them, and if pressured by these clowns, ask them who they think they are to be interrogating you?
Tell them nothing, or else to F' off. They'll soon get the hint. What are they gonna do, DF you for not giving a damn? Grow a pair and be a man and put these clowns in their place.
That is all.