Commitments not honoured regarding data

On the 10th of November 2015 I upgraded my contract after being convinced by the retentions department not to cancel my contract because I will be given an extra 1 gig of data for a 12 month period (Quote no: ***5).on the 1st of April 2016 this data was not allocated into my account. I managed to get through to the retentions department on the 7th in the morning to which I was promised by a gentleman by the name of Olympic that the issue would be resolved within 48 hrs. No one contacted me nor was my data allocated after the 48 hours. On the 14th of April 2016 I contacted the retentions department again to which before I dropped the call at 12:38pm, Phumeza promised that my issue will be rectified within 24hours and with consultation with the team leader, instead of the 1 Gig I will be getting 2Gigs extra for the next 12months as compensation for the inconvenience. As I write this complaint none of the promises and commitments have materialised and I am still with no data which I was promised so that I do not cancel my contract nor the 2 Gigs because they did not honour their commitment!!!