So at the last meeting with me with two elders, they said they had two witnesses, said that now a second sister had come forward saying I had had inappropriate contact with her as well two years ago. But I called the sister from the parking lot, we are still friends, and she said no way did she confess, there is nothing to confess.
Can't you bring this person as your own "witness", prove that you caught them in a lie but say you won't take it further if they leave you the hell alone? Then fade away without any hassle. You could quote all those scrips about liars not inheriting God's Kingdom, Jehovah hating deception and on and on til they surrender. Have it all prepared and make it go on for as long as you can manage to listen to yourself!
Turn it around on them and see what happens.