Poor customer service with Cancellations

Again here I am frustrated with the service rendered by Telkom

You force us to call for cancellations now and we give suftnotice,yet here I am receiving my invoice and you have not cancelled my contract as requested

I was very explicit that I want the router and the device cancelled as they are paid off. I demand call recording and have my invoice reticied. I don’t owe you what you billing me