R2351.22 data cost for one day????

<p>Vodacom billed me R2351.22 for data charges for 30 June (1 day) only. I have emailed them, called them and logged an escalation to which nothing has happened except for an email from a consultant saying that she explained the data charges to my brother as he is the main account holder. I feel that there is a mistake as I can never use that amount of data in one day and the fascinating thing is that I have a limit on my phone of R650.00 so whenever I get close to the limit I get notified and then when the limit is reached, Vodacom locks my phone. Howcome my phone was not locked on R650? What were these charges for? Whenever I run out of data I go to the *111# menu and either get a promotional deal or a once off 1 gig. Please will someone sort this out as I won't pay for this. If this can't be sorted out then I would like to cancel the contract rather.</p>