What a dissapointment

The only reason Vodacom gets one star is because the system does not allow me to give them zero. I have been trying to change my contract to pay as you go since August. Vodacom sent me an invoice for the remainder of my contract which I promptly paid and provided proof to them. I followed up in mid September and was informed that all info was on their system but that they've not acted on it yet. I was promised that they would act on it immediately. Again nothing happened. Numerous phonecalls and empty promises later Vodacom has yet to respond. I was even refused a refr number when I asked for it as they promised the problem would be sorted out immediatly. In addition they kept on trying to sell me a new contract at reduced rates. I eventually got hold of a floor manager who promised that he would escalate the matter and provide feedback to me by Sunday at the latest. Again nothing has happened. This is the worst service I've ever received.