Terrible Service from Telkom Mobile

I requested to cancel my data service with an additional sim on the 02 March 2016 with Telkom Mobile. To date, I am still being billed for the service despite having logged 8 cases with their call centre to escalate the cancelation. Today, 04 May 2016, no Supervisor, no Manager and no one with authority is at work at 16h00. They have all gone home and I get told to go to the Mobile store and fill out another form for cancellation. how ludercris can this be. All i want is for the service to be cancelled. What must i do since I jhave have already submitted the request on the 02/03/2016. Such poor service.