Sometimes sub-addresses can be a little complex. If you live at Flat 2, 3 Queen Street, Levin - try searching for 2/3 Queen Street, or just 3 Queen Street, Levin and clicking on the Unit 2 which shows in the results list.
You may find instances where your postal address reference and title reference are different, for example, what you know as 3A Queen Street, maybe fact be Unit 2 on the title. If the search result does not look right redo the search using the alternative address.
There are no standard methods for how unit numbers or flats are recorded unfortunately, so sometimes trial and error is required.
If you are still having problems send us an email and we will assist you.