Telkom refusal to cancel my adsl service

Hi, I've tried to cancel my adsl service with telkom for the past 3 months now. I've filled in all my forms and sent them the documents they need. Request was made from the 1st of March 2018 and still not a single correspondence or contact about the cancellation has been received. After many phone calls I've learned that the account is loaded with remarks /notes that there is a request, but they choose not to cancel the service and also continue to bill me. I've decided not to pay my bill they keep invoicing since that will be the only language they understand. If this continues I will have to take this matter further. Account number ********** 42