I have personally found that the only satisfying answer they want to hear is how right they are. Something like, 'Hi , My dear sister, you are so right, thanks to your reaching out its like jehovah answered my prayers, I was literally in prayer when your text come through asking for forgiveness and taking steps to contact my local elders so that I may come back to jehovahs loving protection."
What seems to make them flip is no contact/response what so ever at all.
They are going to make up in their mind how superior they are and how "worldly,sinning, under demonic influence, lost spiritually dead, and hopeless you are". no matter what you say.
I see no sense in giving them anything to feed on one way or the other. Its my own personal way of saying "f you " with out saying it. Drives them up the wall.