Case ***9 resolved but still being debited

I canceled my contracts with Telkom in July to ensure that they I give enough time for the notice period. Somehow there was an issue with the cancelation and they informed me that they working on it. Ever since September I am still being billed. I provided clear instructions that I want to cancel the contract and not continue. Cancelation reference 8*** I received in July and case number which ***9 which was resolved in September. I need this contract urgently canceled as per my request when I contacted you. Please note I will be disputing debit order scheduled for November.