Still being billed, when I cancelled my account

On 23 June this year I cancelled my line online ( Request number: ********** 3). And with Telkom you need to give a months notice. So , in July the account should of been closed. But it is still active??? I have not used the line for 6 months but yet I am stilling getting billed. It has been escalated in November, but I am still to hear anything. Why has my account not been closed??? I need them to close the account and remove the amount owning.