CANCELLED ACCOUNT AND STILL BILLED

After contacting Telkon I sent through my cancellation forms and supporting documentation to the agent on the 13th September for my services to be cancelled at the end of the month. I was never informed that there was a 30 day notice period. I moved out of the house on the 23rd September and today (12th October) i received a statement which shows that my services are still active and I will be debited on the 31st October. When I called today the unhelpful agent said that there is no cancellation request on the system and I have to resend her the forms. I pointed out to her that the forms were clearly signed and dated on the 11th October. She then said I now had to wait for the cancellation department to contact me and she has no idea how long that would take . She said that only once the line was eventually cancelled would the back date my account and I would have to wait for my money. It is utterly ridiculous that I have to be inconvenienced because of the incompetence of Telkom and I should be billed for services which I cancelled in time.