Paid up letter and credit profile update

I was offered a settlement by FNB to settle my credit card debt in 3 instalments and I accepted the offer. I paid the three instalments as per the agreement(October, November and December) but I haven’t received the paid up letter. It has been 3 weeks since I asked for the paid up letter but I haven't received it. I need the letter to register my niece at school. The debt still reflects on my credit profile so I need to produce the paid up letter as proof that the debt is paid off. It is causing a delay for niece to start school. Also I need my credit profile updated with the correct information, that the debt is paid off