Dual Sim not active

I went in to the MTN branch in Randridge Mall on Tuesday last week and upgraded my contract. I requested a dual sim to use in my old phone. The dual sim is still not active over a week later. I have called the contact centre 4 times and been into the store to request them to activate the dual sim. I have tried calling the activations number i was given and keep getting cut off. Please sort this out!!!