Still being billed almost 2 years after contract cancellation

Contact was cancelled on1 November 2016, Acc no ********** 14, all the correct procedures were followed and email was sent with customer request for contract and service cancellation attached. WE ARE STILL BEING BILLED and have tried numerous times to sort it out with no help. Went into the TELKOM EAST LONDON, RETAIL PARK branch in early January 2018 and were assisted by a consultant. She told us that the contract had indeed been cancelled but that the debit order had not. She ASSURED US that it was now sorted out. Needless to say, it has not been corrected, we are still being billed and have to reverse it at the bank every month. WE REFUSE to let Telkom take ONE MORE CENT from us, they are basically *****ING from us every month!