Cancellation query still outstanding - billing still going on ?

On the 21 August I logged the below on Hello Peter:

I requested my landline be cancelled with 1 months notice. Should of been done by 8th July. (Case Number ********** 9) I am now getting billed for incorrect things. I have paid for my calls. I plan to pay another R10.53. I wasn't aware that a notification fee had to be paid. I hope this will be resolved asap.

Acc # ********** 27

I was then asked to provide the affected number. Which I did ********** 215.

On the 12th July I received an SMS with the below:

Good day your request details Ref: ********** 01A Notice:back dated to 08/06/18 Your final bill will be sent within 60 days. Regards Telkom

Now I have received no further feedback and have been billed again and have been charged interest.

Regards Rita