FNB does not respond to their clients

I would like to express my dissatisfaction with the debt review process at FNB. Having been through tough financial circumstances, I app**** for debt review and was granted around 6 months ago. Part of the arrangement was that FNB reduces the interest rate that is charged on my FNB revolving loan to the minimum NCR prescribed amount. To date, they have not amended the rate and I am left paying more than by DC negotiated. I have made several requests for this to be investigated and have not received a response from FNB. This is really poor customer service.