Ridiculously high account

I have had an MTN 2 gig monthly contract for about 6 years. On a few occasions I have gone out of the 2 gig amount and had some high bills. One high account was in August 2015 of around R900, baring in mind the 2gig contract is R189. <br> <br> In September I went into the Nicolway MTN store and asked that a CAP be placed on the account so that as soon as the 2gigs was reached the account no longer worked and would need to be topped up with further data should I hit the limit.<br> <br> Yesterday I received my January account and to my surprise the total is R2900!!! I went into the Nicolway MTN store at lunchtime today to query the amount only to find that there was no limit placed on the account in September as I requested!! There is a limit of R1500 reflected but even then somehow the data kept flowing with no notification that the limit was reached and there was not stop to the data.<br> I am not happy that I have such a high account to pay as I took the steps to limit such damage and that MTN has not implemented my requests and this seems to be quite common as my wife has had the same issues with her cell phone account.<br> I'm cancelling all accounts!!!