1, take good care of the evidence
First of all, in the case of 1, we must take good care of the evidence, because from a legal point of view, any law depends on evidence. If there is not enough evidence, even the legal proceedings will not be established, so the evidence should be taken care of first. I suggest you film the leaking place and try to record it when you coordinate. Of course, it would be great if there were videos.
Step 2 call the media
Many media like to deal with this kind of thing, because it is a good material for drainage. If you like, the media will of course expose it for you for free. Just call the famous local media. I believe that the media will rush to the scene soon after learning about it and try their best to help you coordinate this matter.
Step 3 sue
If the above methods can't help you solve this problem, then we can take the procedure of prosecution. Under normal circumstances, we need to submit an application for prosecution to the court, and it is best to submit the evidence we have saved and collected at the same time, so that the court can review the prosecuted case. As long as we successfully submit the application for prosecution, then we just need to wait for the result.