Ai. Overbilling with no explanation

hi guys,<br> I have a 5GB data contract with you. In July i was charged an additional R1600 on my account for a 8 second 30GB data call... The call thereafter was yet again R0.00.<br> There are 2 problems with this. <br> Nr 1. There is no way that anybody can download 30GB in 8 seconds with our internet speed in South Africa (i wish!).<br> Nr 2. When i queried this with you guys the explanation was that i probably reached my 5GB cap for that month and i was billed for additional data. The only problem with this is that all calls thereafter were free (R0.00) because i had not used up all my data for the month.<br> <br> I was then told that my query will be sent through to your data investigation department so that you can check what the issue was. That was about 4 weeks ago. I phoned in the meantime and because i had lost my reference number i was told that they had no record of any query and they suggest i speak to the department directly. That resulted in multiple calls with absolutely no explanation. What am i supposed to do now?<br> <br> Also PS: The wifi device i received has not been working for 2 months. I have phoned your tech department multiple times to no avail. *** :(