Promotional data not credited

I app**** for a cellphone contract on 19 April 2018. The product got delivered on 25 April. I called on 26 April for the sims to be activated as the phone automatically came with a modem and a separate sim, it was a promotion. I struggled for about a week to be able use both sims and I kept getting told that sims were either not fully activated or not properly RICA'd. After almost two weeks the sim card were finally working but there was another problem, the 30gb that was promised when you purchase any LTE device was not credited. So to cut the long story short, I'm probably on my 50th call with Mtn trying to get the data they promised. Every time I call they keep saying it was escalated and I don't know which level of escalation my query is now. I'm so disappointed with Mtn after 11 years of good relation with them, I never really expected this.