I am Doomed to stay on the Blacklist even after settling my debt. Please Help

Hello Peter. I am at a point where I cannot understand what is going on anymore. I have been handed over by Edcon to Nimbble group at a time in my life that I was retrenched from work and was unable to pay my monthly installment. I am not mad at this because I understand that it was my duty to pay and Edcon had all the right to hand me over. I have managed to get back on my feet, started my own business and was able to get the money together to pay the outstanding amount owed to Edcon, through Nimbble group. They gave me a discount for paying the amount in full and advised me that they would send me a paid up letter. This was in May 2020, it is now September and to date I have not recieved any paid up letter and my name has not yet been removed from the Experian scoring platform online. I have contacted Edcon more times than I can count, and it is always the same story"We will escalate the matter and provide feedback" this must have happened around 7 times already and still my name has not been removed from their database. Whats makes things worst, now Nimbble group has added my name to their platform again and I am listed as a non payer. This is damaging to my business and because of it I am not able to obtain any credit facilities from my bank or any other institutions who are able to provide me with credit in order operate my business. I have worked hard to get back on my feet and I might loose all this because of an organisation as big as Edcon, not being able to manage the administrations of such a small and simple process. Please Help a young black trying entrepreneur.