Frustrated customer

I come again because if want to get attention from Vodacom, you can only get it here. Last month I was impressed that they credited me what they have been falsely debiting from my account. My joy was short lived when they billed me incorrectly again. I called and no one seems to understand that they falsely upgraded me and then they removed the upgrade, however the billing is the same as the that upgrade that was made. I need them to fix their billing as soon as possible because I can’t keep on calling them all the time to fix the billing.