I'd recommend climbing the ladder of NZIS, but it looks like that didn't work for you. Last year when our case officer was blowing us off, I emailed a complaint to the contact address on the NZIS website. Soon after, our case officer was responding to us again.

I wonder if it's possible to get a different case officer, though in your case that would slow things up even more. Strange that he won't fast track someone with a waiting job. I thought that was the sort of thing they were supposed to do. It sounds like you got a lousy officer.

I hope it all comes out in the end - good luck.