misleading advertising

Since 10 October my daughter has been receiving daily sms' telling her that if she upgrades to an LTE device she will receive 30 gigabytes of data divided into 10gbs x 3. It was specified that this offer was valid until the end of October. On 18 October we upgraded my daughter's contract. No data came through and my daughter was left to make daily calls to MTN asking when the data would come through. On Wednesday she was told that it would come through within the next 72hrs. Yesterday she spoke to Sibusilo who said it had not been loaded, he had done so and it would come through shortly. It did but in one bundle of 30 gigabytes valid for one month! We were then told by mosholadi that the deal had been changed on the 19 October to 30gb' valid for one month. This is misleading advertising to say the least. It was specified in every sms my daughter received that the data would come through in bundles of 10bg's and therefore this is how it should be - a deal cannot just be altered because it doesn't suit the service provider if something else has been promised.