My airtym and data bundles are disapearing

I have been using Vodacom my whole life, all of a sudden, i had to buy airtym and data bundles every second day. I phoned the call center and they told me i subscribed to something i don't even know. Is how vodacom is *********** its customer, i mean my phone its a contract ( TOP UP) its only the 10 day of the month since they gave me R100 airtym, and believe you me i have bought airtym that is more than R100 to top up in those 10 days. How is vodacom billing us, who is actually taking our airtym and ripping us off. I mean my data bundles have also disappeared out of nowhere...Please explain yourself.