Still billed after LTE account closed

After having constant issues with Telkom LTE for the past 6 months. I went to a Telkom store to cancel my month to month LTE. I went to the store in Early October. I was told it takes around 21 working days to cancel. I received notifications that the cancellation is in progress, and in the beginning of November it was cancelled and no longer worked. I now still received a bill for virtually the full amount for the month of November when it was closed early in the month. I should only have to pay Pro Rata for the few days active in November, not the full month. I have sent messages and emailed Telkom regarding this and have received absolutely no feedback from them.

This needs to be sorted out ASAP. A customer cannot pay for a service that was not active.