TELKOM FAILS TO PROVIDE PAID UP LETTER

Telkom placed a default against my name at the Credit Bureau for a returned debit which charge I have covered within the same month. The listing was in March 2020 which I only discovered when applying for an overdraft increase. I have since logged several requests from last year November 2020 to receive a paid up letter. The last consultant laughed at me when I said I will write a review on Hello Peter. This might be funny to Telkom but they are hindering my financial planning as my credit score is affected by their reluctance to conclude the simple request. What can I do to resolve this issue?