overcharging and over indebting

I have opened a second contract on the 16 June 2015 that was a smart S combo deal (Blackberry Z3 and vodacom tablet) to the value of r199 . I only added CLI that costs around R10.<br> <br> To my surprise i could not use my phone in July and that is when i called Vodacom customer service. I was informed service has been stopped as i have exceeded my credit limit and my bill was R6800 .I went online to check and found that the bill was at R7000 plus.<br> <br> After several calls and faxing vodacom sent me an itemised report that came to R5967.87 .The amout was for 7GB .I was told that my credit limit is R6000 of which i have asked them to tell me how did they come to that amount as the amount is more than my disposable income hopwever until now i have not received a response.<br> <br> As per my contract the first limit is R2000 of which i was told i would be warned should i reach the limit. I never got that type of notification or warning. Also how can data costs so much when there are deals where 1 Gig cost as little as R100 and they charge R1000?<br> <br>