Hi @Levixmo,
If you have a Commerce Advanced plan, and you're based in the US or Canada, if you set up local shipping zones restricted to your area, customers who try to enter an address outside of that area won't be able to, so they won't be able to place their order in the first place.
To ensure this works, make sure you don't have any other shipping options enabled for the rest of your country or 'Rest of the World'.
If a customer decides to force an order by using a ZIP code that you have permitted, but then enters in address details which are actually not within that ZIP code at all, you can cancel and refund the order with these steps.
I hope that helps!