Where is all y data going???

<p>I am really upset. By this time laste year i had the same issues with Vodacom.</p> <p> </p> <p>I recharged my phone with data and airtime. This happened on 31 Oct and 25 Nov. R110 and 1 G of data. Most of the time i was connected to Wifi .... and with NO warning, all my data was finished. You took 1 G of data and my airtime with NO warning. I had to buy airtime again.</p> <p> </p> <p>During the month i Recieved about 15G of data when i upgraded .... It was not even one month then it expired.</p> <p> </p> <p>Can someone please sort this out?</p>