Cell C consultants are not doing their job!

I bought a new phone last week Monday from Cell C at the Woodmead branch. I was told that the sim card will be activated within 24 hours and until now (7dyas later) the sim has not been activated, this is the second time this is happening in a space of 6 months. I have spoken to numerous consultants over the phone who have promised to get back to me but never did. My phone cannot operate without the sim being activated and as a result I'm losing business and important phone calls. Cell C consultants are not doing their job, they promise but never deliver.