Billing on Expired contract

My contract expired on the 14th of October 2015 and I have logged a request on the 29th of April 2015 to provide notice for a cancellation of cellphone contract when it expires. When I check on the 23rd of October 2015, I was surprised that the contract is still active and contact Autopage again and they promised that the contract will be cancelled before 31 October 2015. On the 1st of November 2015, I checked and realized that the contractis still active and Autopage have allocated contract free minutes, data and sms of which I did not use. I contact Autopage again and they promise to resolve the cancellation before 07 November 2015 and the call reference number 923185. On the 12 November 2015, the number is still active and I have received an invoice for November. I contacted Autopage again today on the 12th November 2015 and the lady at call centre indicated that the number is still active on the network and it is not cancelled. I insisted to speak to the Cancellation manager and she dropped the phone. I have run out of options on how to have this issue resolved as Autopage Customer Care is not helpful at all, I have tried logging call online and calling customer care.