Vodacom: unfair practices and treatment

I am a Vip red client with 5 gig per month. Vodcom is clearly not in control of their data billing practices and the customer pays for their mistakes! I use a lot of data and have ran into massive bills for the second time although constantly monitoring usage! Whether from my phone's meter or by dialing *111# as instructed. I have found out with a shock that i have a data bill of R21000,00 odd. The balances reflected by vodacom was not accurate at all! How can I as a customer be punished for such inaccurate feedback. Their SMS warnings are a 100% accurate for 6 months+ and then all of a sudden you dont get any warnings for low data so their excuse that the sms can get delayed is *******! The sms warnings have savd many times before becaue in the end I need to trust their numbers and not mine. If they can provide a accurate reading and sms service for 6+ months why should i who already pays a fortune on their totally ripoff packages be puninshed twice! They should provide reliable service.I think Vodacom delays their sms for low data, so by the time you load data, already to later, and bamm they bill you 21k extra. I think it's time to move to another network!!