Extra cost charged onto account

<p>In December last year, i have noticed an extra charge onto my account labelled as data usage. I double check my data balance and i had sufficient data available. I phoned vodacom the very first time and a case was opened. The consultant stated that it will take 7 days to resolve. Up to today nothing has been done and vodacom had already debited my money.</p> <p> </p> <p>This month, i have noticed the same thing, a data usage fee when i have a data available. I contact vodacom to resolve this query, they promise to resolve but nothing happens.</p> <p> </p> <p>Very frustarted dealing with a non complient service provider</p>