Telkom refusing to cancel a contract after it has expired.

I took a 24 months contract with Telkom, this was 2 years ago, August was my last month, I notified Telkom 30 days in advance that I would like to NOT continue with the contract. I called the call center and I was told to do it online/app, I did so and got a confirmation email. Since then, there has not been any progress, when I call the call center, I would spend almost an hour holding, this happened regularly throughout my contract that I would struggle for service (thats a separate issue). To my surprise they billed me in September again for the contract I requested to cancel and even gave them the stipulated notice.

I fail to understand why is it such a mission to cancel a contract. We are being forced to remain on contract and I would discourage anyone from taking a contract with telkom for this reason, among many other reasons.