Hi Muhammad,
Sorry to hear that your visas got rejected in the past. You can always consult a licensed immigration advisor authorized by the NZ govt. Here is a handy list of licensed immigration advisors and those recommended by friends. There might also be some in Pakistan. I would advise you to contact both NZ advisors and those in Pakistan and try get free consultation session with them. They usually give first 20-30 mins free consultation and can then be in a position to advise you the best option:
Good Luck!