STILL BEING OVERCHARGED ON MY ACCOUNT AND NO RESPONSE FROM VODACOM

Vodacom I am going to keep complaining repeatedly until you respond. This is my third time complaining about being overcharged and you still haven't had the decency to contact me. You sent a generic mail apologizing to customers saying you would adjust their accounts but this is a new month and you are still overcharging me on all my contracts. How can this be acceptable? Surely this is not legal? I demand you adjust my invoice to what you just quoted me on and refund me the difference for last month. Failing this I have no option but to report you to the consumer council.