Require Paid Up Letter after finishing Loan Acc

I had a loan with Nedbank and it was handed over to NRB Risk Solutions in Cape Town, since contacted by NRB I have been paying my account on monthly basis until 21 July 2015 I received an sms from NRB requesting me to pay my account and they are going to negotiate a big discount for me. I accepted the offer and I paid same day R4800.00. Upon NRB requesting a paid up letter I have been waiting and phoning them to get the letter they always say they are waiting for Nedbank to provide them with the letter. The lady at NRB suggested that I must phone myself may this will speed up the process. This is the fourth week now at Nedbank I am sent from Pillar to Post and the last time I spoke to a lady by the name of Sherin/Sharon at their legal department who was not willing to assist me at all refering me to NRB. I think this is too much. I am being punished because I paid late. I dont think this is fare. I need intervention. <br> <br> I finished paying the account on 21 July 2015 and my name still reflects badly on experian and ITC because they are refusing to provide me with a paid up letter or they are not willing to change my status on the Credit listings.