Boundary and land ownership issues
Issues with a neighbour who owns or maintains a boundary, or if the boundary has been moved, are civil matters which need to be resolved with your neighbours. We do not have any jurisdiction in these matters.
Your neighbour may not know how the problem is affecting you, so try and discuss it calmly with them, explaining what the issue is, how it upsets you and how you would like the matter resolved.
If the problem persists you can seek professional legal advice.