Cancelation Issue

My contract term ended around Sept 2017. I received an sms that my contract was converted to a month to month. On 9 Jan 2018 i sent a cancelation email with the completed document to Telkom Cancelations. Two days later I tried to follow up by contacting the call centre (I have proof of the conversation) and I was told they cant give me confirmation but I will receive a call within 21 working days from the cancellations department.

I am still waiting for the cancelations department to send me a confirmation and A week ago the service stopped working and yersterday I was billed again for another month? I need an update on what is going on!?