Data theft or data ***** at Vodacom intolerable

I have a data bundle contract with Vodacom consisting of 50G daytime and 30G night-owl data. My usage is such that every month by the 28th approx. I run out of data. This is when my data usage is high. Today on the 11th of the month I cannot access the internet because according to Vodacom I have used all the data on my bundle??? This is Not the 1st time I have this issue with Vodacom. It has been proven over and over that Vodacom customers lose data due to data theft of whatever nature. Vodacom acknowledge this fact yet does nothing to prevent or stop this ********** activity. Apart from being the most expensive service provider in the industry, we as customers have to put up with this issue which is absolute nonsense. I will most definitely cancel my subscription this week and find. A better solution to my business requirements. As a small business owner I simply won't carry on like this.