Breach of contract, promised data not received

I upgraded in August 2018 through MTN Direct who gave me voucher code for an additional 2Gig data for 24 months on top of my 24Mth MTN Made For Me M-contract (AM24M). I'm not receiving this additional data. It's luck of the draw if you reach an MTN Direct consultant through the MTN Direct no. provided on the website ( ********** ). I managed to speak to a consultant 7 days ago who said she noticed the problem on my account and gave me a ref no (1- ********** 8863). I received an SMS on Mondag saying the issue was resolved. It has not, I'm still waiting for the additional promised data. I also get transfered from one MTN-consultant to another when I phone to follow up. This is breach of contract. Can anyone help me to get what I'm paying for?