A wise exiting witness told me they only harrass the disinterested. They leave the needy alone. I suspect they have sniffed out your lack of neediness.
When I am with Witnesses I practice flipping them in to their natural personality, by asking after their interests. I never gave a Pioneer my phone number or committed to a study. I can have a natural discussion with a Witness for a good long time. If they snap back in to cult mode, give a noncommittal answer "mmm" and try and flip them natural again.
Anyways that is how I entertain myself.