I'm just wanting to know how I go about recovering unpaid child support of over $41,000 my child is now 18 The father is

Customer: Hi there I'm just wanting to know how I go about recovering unpaid child support of over $41,000 my child is now 18 The father is working selling firewood I've notified Inland revenue of this with proof, he has assets he owns that he uses to work for cash so this is allowing him not to be back paying any child-support payments by working for cash. He had entered into an arrangement to pay an extra $100 a month towards his outstanding dept and has since missed not paid for months. I feel very let down and distressed about the whole situation. I have put in letters of disagreement to IRD and to the ombudsman with no help at all. I don't feel like I've been treated like my life matters or my daughters for the last 16 years just scrapping by while He stills breaks the laws etc. My voice is unheard. Any help would be appreciated I would ideally want him taken to court fir amount outstanding.
JA: When was the last payment made? How much is owed?
Customer: The last payment made was 21 December of $190.28 he was meant to pay $634.30 not including the $100 per month that he had entered into an agreement with IRD to pay monthly. Total amount if money owing is $51,880.05. There is no way this will be paid by the time either myself or he passes which is rediculous.
JA: Has a court order been entered for any unpaid child support?
Customer: No as I am unsure how this is dine or what my rights are
JA: The Family Lawyer will be able to walk you through that. Is there anything else the Lawyer should know before I connect you? Rest assured that they'll be able to help you.
Customer: Thankyou so much, I appreciate your help. The only other thing I can think that the Lawyer should know is I had a protection order issued against him around 16 years ago. I am unsure wether this is important to know. Thankyou again for listening.