Reblake not giving me any assistance

In May 2019 Reblake contacted me in regards to my Cell C Fiber account that was handed over to them. Reblake offered me a discount if I settled the account, and I paid them the amount they asked for on the 29th of May 2019. Reblake informed me that I will receive my paid up letter within 7-14 working days. I then left it for a while and then started phoning Reblake for the paid up letter. after several phone call to date with reblake they keep telling me that the request for the paid up letter has been emailed to Cell C with no response, and that they will send another request, and up to date they still cannot give me an answer on the paid up letter, they have the same story over and over again. Reblake keeps telling me that I need to contact Cell C, and I keep telling them that every time I speak to them I speak to Cell C after, and not Reblake or Cell C is off any assistance. Please explain to me that how can two companies work together like reblake and cellc with no communication. This is unacceptable because when you guys phoned me and asked for the money I paid the full amount, so I need my paid up letter from you. I am tired of phoning both Reblake and Cellc for something that should have been sorted out a long time ago. This is affecting my credit score as CellC still shows an outstanding amount on the credit profile. I really am now tired of both Reblake and Cellc's games.