Data disappear

<p>I purchased a 500 Meg bundle for 7 days, received an sms, but no amount was added to my balance, called customer careless this morning and was advised that the bundle was depleted in seconds.</p> <p> </p> <p>1. My auto updates are and have always been switched off</p> <p>2. I understand how to efficiently use data (a 2 gig bundle lasted 22 days for the month if March)</p> <p> </p> <p>Please explain how and when the data was depleted, as the Vodacom service isn't even fast enough for me to use all that data in seconds.</p>