Terrible SERVICE!, Over Billing of Accounts!!

I have been with Vodacom for almost 3 years now, in the first year everything ran smoothly and the debited my account correctly. Ever since last year September they have been debiting my account with a higher amount every month my full monthly cost is supposed to be R1094 eventually in June this year the debited an amount of R2500.00! I called the customer care call centre numerous times to just be told by them that they can definitely see an error on the account and will escalate the matter still nothing... Eventually I had to go put a stop order on the account to prevent them from just taking debit orders and I would manually still nobody calls me to rectify my account the just get an automated call to call me to make a payment arrangement for the outstanding amount that they are billing me incorrectly! I even went as far as going into the Vodacom customer care at Vodaworl Midrand where I sat for 3 hours just to see someone for her to tell me the same thing, there definitely is something wrong on the account and she will escalate the matter, yet still absolutely nothing!!!At the beginning of this month I upgraded my contract as it was due for an upgrade not only on the my vodacom app have the charged me for the upgrade they are also charging me for the old contract as well as double charging me for the data! isn't this supposed to be apart of the new contract!!!! my upgrade amount was R1647 pm, they are billing me R2739 and everyday I go on the my vodacom up that amount goes up, on Friday the 13th October it was R2 223 and now R2 739!! this is ridiculous I refuse to pay almost R3000 for a contract that is supposed to be half that price! where I get minutes and data combined in the contract!!! yet still nobody wants to contact me or yet rectify this!!! In the meantime while Vodacom does absolutely nothing about their billing error 1. I get a negative credit rating on my name because they mark me as a bad payer yet they are invoicing me incorrectly and I refuse to pay what I shouldn't be paying! 2. If I do pay what they so called say I owe then it puts me out of budget completely meaning my medical aid won't get paid, kids school fees won't get paid, groceries, I can't put petrol in my car, because of your incorrect billing Vodacom you are effecting peoples lives and lively hood people can not just afford to be double billed and pay double what the contract stipulates because you can not get your billing system correct or even get someone to contact me once it has been escalated!!!! someone needs to do something soon to rectify otherwise I will takes matters further.