Clear my account and send me the settlement letter.

I unfortunately lost my job in 2017 and as a result, a number of my contracts lapsed. when I got reinstated, I started committing to keeping up to date (this year 2021) with my debt obligation/s. Telkom had already handed me over, during which I was making payments to A third party company( Nu Debt). on the 20th of May before effecting my final payment. I called in to verify and confirm that the payment will be a final one, which will then bring my account to a zero-which will ultimately constitute a settlement as I really struggled to pay it off due to already mentioned reasons above. and also had requested a settlement letter, which was promised to me. The details of the mentioned call are: 20/05/2021 time of the call 10:29:55 duration of the call 26:23 end time 10:56:18. these call details before the final payment have already been furnished to Telkom to listen to the call. the following Month of June- I received a statement with a balance owing of r54, to which I thought perhaps was a mistake. Now I received another statement on the 5th of July with a balance owing of r301.41. I called Telkom on the same day at 10:08 to better understand, and was told that they work from home and would get a senior member to contact me back. the call was made on the 05th of July 2021 and I spoke to Herman Lekuoane the call lasted for an hour, with a lot of excuses and them not understanding their system fully. I demand that this be rectified, as the account was handed over, and that debt was accordingly settled on the day of the call being the 05th of May 2020.