The best way to report an issue to council is on their website at https://www.midcoast.nsw.gov.au/Contact-us.
You should be able to find the appropriate category from that page. Responses are quick and get assigned to the right people straight away. The problem will be assigned a trackable number and if you need to phone or write then this allows your initial complaint and any actions that council have instigated to be found immediately.
I was overcharged on my last water bill and it was sorted out in two days. And no, it wasn’t that quick because I’m a councillor.
Happy reporting!