Overbilled for no reason

I have had a Smart S contract with Vodacom for the last 22 months. On the 1st of September i did an uprade to a Flexi 200 package and was told i would only be billed the following month, which in this case would be September's usage payable in October. But much to my dismay i was billed for the new device on my August bill - please note that i only received the new device on the 2nd of September. So now i ask why i am paying for a device i did not have in August??? Vodacom is continually charging me for nonsense. If i didn't have it in August i should not be paying for it on August's bill. It is just that simple. Coming from a financial background i know very well that i am being taken advantage of. I want the amount of R 280.00 for the new device taken off my August bill immediately or i will be reporting Vodacom to the Consmer Protection Commission. MONEY DOES NOT GROW TO TREES!!!! Also, educate your call centre agent to stop sounding like robots and start going the extra mile to help clients. Gosh! No wonder Vodacom has lost market share recently. Not to forget, i was also told that if i waited one more day for the upgrade i would not have been billed the R280 on Augusts bill.