Still Waiting on MTN 30GB Promo Data

I upgraded both my contracts at MTN Canal Walk on Saturday 2 April 2016. The contracts included 30GB Promo data and the consultant advised me that it would be loaded on my phone soon. I have been calling the MTN Call Centre (Really a waste of time) since last week to get the 30GB loaded and every-time I call they say they will escalate it and I have to wait 2 to 3 days before it is loaded. When I called again on Friday they say I must go to the store. I am really frustrated as this is MTN's messup and why do I have to go to the store. I believe this is breach of contract as MTN is not honoring the agreement and I am therefore considering cancelling both contracts. I have been with MTN for almost 20 years and they are just getting worse and worse. Please advise how you can sort this out else this will be my last time with MTN.