Telkom Mobile - Service Provider fails to cancel on date specified online & now I must pay!

Took out the July Deal in 2017 (24-Months contract) and as the contract period was coming to an end; I went to the nearest Telkom store and were advised to cancel my contract on Telkom's website. I logged onto their site and followed the advice to cancel. This was done on 30 June 2019 and as per the policy on the site you count 30 days (not working days) which worked out that the last day of July the contract should have been cancelled. After accessing the app, I realized that I am being billed for August, a new contract is being taken out (possibly on month-to-month basis) and I immediately declared an dispute on the amount, but could not dispute the new contract application which was pending in the app.

A couple of days later, I tried accessing the app again, but could not login to see the status of my dispute with the bill.

Today I contacted Telkom on 081180 only to learn that my cancellation was only processed and cancelled on 15 August 2019.

To top it all, I am being billed the full amount for the month of August 2019 and I did not use the data and modem in August!

I then requested the lady at the Telkom Mobile call centre to give my number so that the manager can contact me to please explain how they failed to CANCEL the contract as per the instruction of the client on the DATE selected on THEIR website!

If this matter is not resolved, I will have no other choice but to take this matter to the National Consumer Commission.