25k data bill

I am in shock after receiving a R25k data billed for alleged data used in a 24 hour period 62GB of data? What data,what could I have downloaded I don't download movies what on earth could it possibly be? I cannot think that the Vodacom network can download that amount of data in 24 hours? I would like to know what was downloaded and how can the contract be allowed to run up like that ?