Make a formal complaint in writing. Be sure to include a printout from your bank statement - try to get it with the bank's letterhead etc. If they still say no, then because they are a government agency, you can complain to the ombudsman:
http://www.ombudsman.parliament.nz/m...51307131224760
For $50 or so I wouldn't bother. However it's large enough to be worth spending a bit of time following it up and hopefully you have enough evidence to convince them if done through the correct channels.
If you call up/walk in, you're just dealing with the person who happens to be there at the time. They usually have no authority to do anything and their life is easier if you just leave it, so complaining in writing will hopefully mean the right person sees it.
Let us know how you get on.
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