Data usage R8009.72 - S3-8WG2J-JEIF9

I have a 2gb data ****le contract with vodacom. Since 2011 my average spend on the ****le is R87.42. I have also installed the 'Vodaphone Mobile Broadband' program (that i got with my ****le) on my PC, and i have set in that program that i cannot exceed 1gb then it should stop. Obviously the program doesn't work because after receiving a bill for R8009.72 from 3 Feb - 8 Feb 2015 and I hardly ever used it as i have uncapped adsl. So there is no reason for me to use so much data on my ****le and I didn't receive any notification of my data being low or out. Why do you suggest we install a program that you supply to your clients with the functionality to limit data usage but it does not work? I never receive a itemized account as stipulated by the consumer board.