******* Investigation and incorect billing

On the 16/07/2015 was billed for 1GB of data in a time period from 9pm the previous night to 9am in the morning, of which 400MB was at 5am in the morning. I queried this with the accounts dept informing them that while at home my cellphone is on WIFI and again when i arrive at work at 7am, regardless of the fact that at 5am in the morning i am ASLEEP! the cons informed me that the information i had was inaccurate and they would send me an accurate breakdown, which when sent to me was exactly the same, on top of that they sent me a patronising email informing me that i clearly do not know how to use an iphone, and i have owned iphones for the past 5yrs, with vodacom!!!, i find this attitude extremely insulting and it is clear that your \investigation"was a complete farce and you had no interest in listening to my side of the story or even considering a glitch in your system"""