I have contacted the authorities. They suggested me to find a "licensed immigration" advisor or an "immigration lawyer".
What is the difference? Are they just two words for the same identity?
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They are not the same.
In NZ, one may give immigration advice only if licensed by the NZ Immigration Advisors Authority (a NZ government office) to do so, unless exempt from such licensure. You can learn more about the IAA on their About Us page. Briefly, IAA
Lawyers are exempt from IAA license requirements, and may offer immigration advice if they are licensed to practice law in NZ.