You are very unlucky to have this kinda neighbour. But we can see that your relationship with this neighbour has been so strained that it will be very difficult to be mend. You have to imagine that you will be facing that neighbour for yrs to come. With current relationship you dont just see black face neighbour everyday. For example, my neighbour and the other neighbour even quarrel because their flowers pot are slightly off to the other side. They parked at the parking opposite their house. It also go to the extend that the neighbour installed grill infont of their Hilux and purposely bang the other neighbour's car. You should serious consider this if you intend to bring the issue further.