Telkom not assisting with cancelling subscription - 4 months later

I have been trying since April to cancel my Telkom subscription/line, but with no avail. I've chatted via chat, I've spoken on the phone to an agent and I've even filled out the necessary documentation and sent it back. Yet I am still being billed, and the account is getting higher and higher.

I am at my wits ends as I cannot afford to pay this high amount