Cancellation of services - Still receiving monthly invoices despite cancelling 3 months ago

Dear Telkom. I submitted a Consumer Contract and Services Cancellation/Retention Request on 4 July 2017. I am still receiving invoices. I paid up my invoices for July and August but I have still received invoices for September and October. I have sent numerous emails requesting the matter to be resolved but have not had any luck. I have even dealt directly with a person at "TFL Billing Customer Service" and they have stopped responding to my requests. If these invoices are not retracted and this matter is not resolved within the next week, I will lodge a complaint with the national consumer commission. I am absolutely fed up with your pathetic customer service. You are very quick to inform customers that invoices are outstanding but nowhere when your customers want something done. USELESS COMPANY.