Telkom cancellation nightmare

I cancelled my LTE contract last month, i gave more than a month notice and i am aware of the cancellation fees, I phoned Telkom mobile today and spoke to 2 ladies, i was on the phone for 30 minutes, Both these ladies take my details, and ask me to hold, after holding what seems like forever, i get put through to the survey, without having any resolution to my cancellation as it was supposed to have happened on the 10th of April. How am i supposed to follow up on my services if the telkom call center agents does not do their job? Who am i supposed to call? This bad service has to end...