Cell C and their "paid up letter"

posting a 3rd Review about this Company Cell C. . .I have cancelled my contracts with them as I said I would and now a couple of years later I saw my credit score was not looking too good .. . .there is a R163 arrears bill from Cell C which is affecting my credit score after I settled all my accounts apon cancellation . . .So I phoned and was told I do not owe anything and they will send me a "paid up" letter . .this was on the 16th Feb 2021 and was advised I would recieve the letter latest on that Friday ( 19th Feb 2021) . . I phoned again on that Friday (19th Feb 2021)and was advised it would be on Monday (22nd Feb 2021)that the letter would be sent ....and as you know that was a lie aswell .....as I phoned on monday (22nd Feb 2021) again demanding the letter they advised me it would take 2 more weeks for this letter to be sent to me because they have to do an investigation and then go through the legal department and so on and so on . . in the meantime I was applying for a homeloan which do not know will be approved because of this *********** company