Two weeks to activate SIM and call centre cut offs

Two weeks ago I purchased a duplicate SIM at MTN Cresta for my iPad. It still doesn't work. Countless calls to the call centre proved fruitless because EVERY single call got cut off!! The tenth agent Dulcie actually offered to call back, which she did. The sim is now active but 3G doesn't work - apparently it's blocked. I was told it was an error and has been escalated. Today, still nothing!! 2 weeks later - how can this be considered service? Where is TCF in this process? I'm absolutely appalled!!!