Incorrect Billing

On 29 Oct 2015 I ran out of data and called the call centre to load me a R59.00 (250meg) data bundle on my account, the consultant made a mistake and loaded a 2Gig data bundle for R249.00 and I discovered it after switching my phn off/on. I called back imm. and then spoke to a gentleman who tried getting the bundle reversed the same day, by telling me to switch off my data until he calls me back and had spoken to his supervisor. The reversal did not take place as their lines were down the whole day and he lodged a service request on my behalf (S3-9J93J-JAHP2). The 2Gig was eventually reversed but an sms advised me that the charges will still go through on my next bill run of the 1 Oct 2015, I was very unhappy as I did not make this mistake, VODACOM did and if they can bill you same day why cant they pass a credit the same day, so I called the Accounts dept on 31 Oct 2015. I was put on hold by the lady that answered my irritated call as she called up my service request (incl sms info sent to me), she explained that I did not understand the sms correctly, that when I receive my bill there will be an amount of R249 and a credit of -R249 as well to cancel it out, THIS DID NOT HAPPEN!