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in ND dollars preferably? its a small dent in the corner with scratches that doing care about on the bottom

Don't think there's a way to "fix" it. It would most likely have to be replaced, which is $$. From what I've seen, replacing the unibody is expensive.
 
The cases cost ~$100 here in the states, so approx 120NZD if you're lucky. But this requires doing the job yourself.
 
What about getting it done by a professional I have replaced ram before i don't wan to mess withe dented case.

Why can't you replace the dented cover if you've already taken it off once and put it back on. It's the same thing, except you have a different bottom case....
 
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