Telkom Billing - Wifi Cancelled

Good Day, I have called in on the 09.10.2020 to cancel my Telkom Wifi. The lady who assisted me confirmed that it will be cancelled on the 09/11/2020. I had a landline linked to it. On the 01/11/2020 the landline was deactivated and on the 09/11/2020 the Wifi access was cancelled. I pay my account a month in advance therefore the payment was made around the 20/10/2020. In November and December I received another bill for a full months payment despite paying in advance. I called the call center and spoke to Matuto Dlamini 07/12/2020, I explained to her that I pay in advance and the installment for November was paid in October and in this case, Telkom owes me money. She is completely ignoring the fact that from the 09th October to the 09th of November an installment has been paid and a full months installment has been paid for November despite me using the Wifi for only 9 days. She says to me that I would still need to pay another full installment in November because Telkom gave me the complete service for the month of November. My contract was completely cancelled on the 09/11/2020, what nonsense is this woman speaking? I require my account to be resolved immediately and please provide proper training to Matuto Dlamini because she is not capable of assisting customers due to her lack of knowledge. My account number is: ***.