Inaccurate data consumption

Since Monday,I have gone from pillar to post and have constantly gotten messed around by Vodacom.No one has the decency to follow up on emails, also no one calls back even with a reference number.I have not used my 3g ****le since December.I am meant to have 2 gigs per month of data.3 days ago I tried logging onto my 3g ****le and I got a message saying that my data had been depleted.As incorrect as this is, I topped up with 250mgs.This was literally eaten up in a matter of 5 minutes. I then reloaded another 500mgs the following day and the same thing happened. In essence, I should have 4,750 gigs available. As mentioned, I have called the call centre and especially the last lady I spoke to, have been pathetic!I call the correct number for business and constantly need to get put through to the business department, where no one has been able to help rectify this problem. I know I am just a 'number' at Vodacom, but I am sick and tired of this pathetic service! Someone was meant to call me and no one has. I have 4 phone lines and 3 data lines which I am about to cancel if no one gets back to me today! I am also still waiting for someone that I emailed to send me bills to me via PDF