When we are talking to a Jehovah's Witness we might think we are talking facts with them but we are not. They are looking through a lense
of assumed facts they have already concluded as true. For example: "if these are really Christ's brothers as the governing body surely we should listen to them". We can never argue with their idea directly because that is how the evidence is pointing to them and they don't know their presumed facts are wrong. So in short we have to create another reality so to speak for them not through trying to destroy their presumed facts but showing them "new" ones. After all how did Jehovah's witnesses convince us? By trying to discredit all of our facts or did they start building their own story?
They did it through creating a new narrative first and in some ways that is what we have to do with them.
This is just one method of talking with Jehovah's Witnesses and it always depends on the situation.