1Gig of Data not received but billed for it

Good day<br> <br> Vodacom is troubling me a lot when it come to them having to load data for me at the beginning of every month and when I call them to find out what is going on they always give me different stories as my call is always answered buy different consultants. May you please help me get to the bottom of this because it is total inconvenience as i no can not surf the net or even receive emails due to lack of data but they still debit my account for it. I have experienced this numerous times.<br> <br> Please help me