Sounds like you have your jaw set and admittedly lack basic skills in how to conduct yourself in a civilized fashion. I get angry at things as well, some that make my blood boil, but I always talk to people civilly even if I hate their guts and disagree with them 1000 percent.
I would discuss it with said neighbor and if that doesn't work then get a lawyer and take them to small claims court and demand restitution. That's about all you can do. Oh, and be polite to the judge, you catch more flies with honey. if you continue to buck the system you need in order to win this dispute, then expect the same attitude and traction as you've gotten thus far.
