Telkom fails to cancel month-to-month contract

After expiry of contract (SmartPlan150), it continued as a month-to-month contract, with a 30 day notice period. On 4 November 2015, I gave notice that the month-to-month contract must be cancelled, by completing the required form at the Telkom store in Tygervalley Centre. To date the contract is not cancelled and Telkom continues to bill me for the contract.