Vodacom is the worst

Can a manager from Vodacom please contact me, as I am sick and tired of receiving bills after I cancelled my contract. Each time I need to phone into the customer contact centre, and explain my whole story again, just to be put through to a different department to explain my whole story over again. Then nothing gets done, then I must phone again, and then I am back at square one. I am totally and utterly disgusted with the kind of service that I received from Vodacom for the past 3 months. But if you want to upgrade or open a new contract, Vodacom falls over their feet to assist you.