Charging for a plan that I am no longer on

<br> Contacted Mweb in December and changed to a plan that they quoted at R449 pm . Despite confirming that the plan had been changed . Two months later Mweb are still charging my account at a much higher rate of R599 pm . <br> I contacted Mweb a week ago requesting a refund for the overcharged amount . I received a response that the matter was referred to the billing dept with reference *** .<br> <br> I have received no response from the billing dept . How is it that if a customer is late with payment , his service will be cut or he will be charged interest . Yet suppliers like Mweb can overcharge a client , not respond in reasonable time , and waste customers time by having to chase after them for refund after being overcharged.<br> <br> Mweb needs to refund me with immediate effect all overcharged amounts plus interest at prime on the overcharged amounts