Welcome, I am glad you know tatt now, so you don't have to put up with this abuse. Nothing I hear any more surprises me about the people in this religion, I have come to believe that not only are Jehovah's Witnisses not better than people from other religions, they are often a lot worse.
If the elders question you, just tell them that Jesus said you would recognize his true followers because of the love they have amongst themselves. Since you have not been shown love by them or this person you can only conclude that they are not true followers of Jesus, so you are going to treat them as being disfellowshipped by you.
Be prepared in case this crazy person continues to try to abuse you, you may have to get a restraining order.