Discounted Debt settlement

I have had a loan with nedbank since 2011 when I lost my job they refused to pay the insurance,fast forward,they have put me on judgment,I have recently got a contracting job,which is for 6months I told them I want to settle my account withR50k,so that when I no longer have an income they cant keep calling me,they declined,I am wondering is it because of my skin color because I know of people who paid much less to get their debt settled and written off.Why are they making my life miserable?