Vodacom EATING OUR DATA

Where does all my data go? I have been going through so much data in a month more than usual. And when I bought a what's app bundle it never showed up on my app like it would befor so I bought it twice more! Now I am sitting with all this what's app bundle that will never be used before the time is up. Please can u give us answers to where our data goes I am not the only vodacome customer who is UNHAPPY!! this makes me not want to continue my contract with Vodacom and I have been with Vodacom for many years.