You are in the RIGHT it’s your neighbor who is causing the problem by his irresponsible behavior.
Conciliation (the first step) lawyers are frowned upon as you are trying to resolve the issue not get into a legal fight.
Adjudication it is more acceptable (but expensive) to have a lawyer but you have such a cut and dried case it would be a waste of money. Also Adjudication is generally (but not always) just you present your case in writing with att documents and your neighbor does the same and their is no meeting the Adjudicator decides on the documents provided.
Takes about 3 months in total.