Switch over ADSL to Fibre

Please could someone help - we have switched over from ADSL and landline to Fibre service only. First the Fibre was not activated in August, only in October as confirmed by the technical team, yet the finance team insisted on billing this service for the mentioned period. Then when the Fibre was finally connected (after Telkom did not supply all the cables!!!! ) we immediately gave notice for the ADSL service to be disconnected. Online logging of disputes are not reflected - have wasted so much time. One succesfull telephonic dispute in January helped with this double billing. How on earth can I get Telkom to switch off the ADSL and phone from October 2019 and cancelling and refund the billing. How do I get Telkom to only bill the Fibre from the date activated October 2019?