No paid up letter 1 year after payment and Cancellation + false information on Credit Bereau (written off)

I have been asking Telkom for my paid up letter since I paid off both my contracts on the 3rd of February 2021. To date I have been calling 081 180 only to get a reference number and be promised that I will receive the letter "by close of business" or "in 48 to 72 hours". I have been calling daily since the 4th of February 2021 yet no Paid up letter has been sent to date.

I also have my credit profile state that one of the accounts was "written off" and this affects my credit score adversely as I am seen to not pay my debts.

TransUnuon requires the paid up letter to correct this yet they are unable as I have not received the Letters to submit to complete this.

I have been calling all morning today and each time I mentioned that I am following up for my paid up letter I either get cut off or get transferred to the "rate call" prompts.

Please assist ASAP. I need to Urgently rectify my credit profile as this is a great inconvenience