Why is my domestic shipping not working correctly on Shopify?

Hi there, I am new to shopify and I am based in New Zealand. I have followed the steps needed to set up shipping options. I have had a customer email saying that we do deliver to their area! Which is wrong as we offer delivery nation wide. I have jumped into my settings and redone all the steps but it is still saying we dont deliver to the area. Can anyone help? I have emailed an expert but he wants $200 to fix the issue

Hi @RemarkableFungi ,

It will be great if you can share some screenshots of your shipping zone settings. It will help us to understand the issue more clearly.