utterly poor service

I'm fed up with Vodacom call centre. I've called several times to cancel my debit order and its been 3 months now and yet its not cancelled and every time I have too pay an additional R100 because of the debit order not going through. I phoned them, I told them that i'm paying EFT because I have changed banks. No this is seriously bad bad poor service, its costing me money for your pooooor service. IF this does not stop and get corrected, i will not pay any additional fee anymore. i hope it will get results, or I will have to take legal steps. i am sick and tired explaining and paying for nothing.. STOP MY DEBIT ORDER IMMIDIALETLY