Late delivery and incorrect color delivered

I ordered a phone telephonically with the MTN retentions department for my contract upgrade and it took forever to get to me. Not only that, they delivered a phone that I specifically said I didn’t want. They gave me a space grey phone with a black front which I specifically said I didn’t want. I stated to the consultant that I wanted a white phone and she confirmed that I would get a white phone. Now I’m told that I have to take the phone to the nearest mtn store and they have to take the phone back to the retention’s department only for me to wait another 7 working days for me to get the phone that I initially requested!!! This is pathetic service and I want this matter resolved urgently! I need a phone and I am not willing to wait another 7 working days till I actually get the phone that I want, the phone that I am paying for!!! The incompetence of Alice Mhole from the retention’s department is Appaling and I demand a tangible response on how this whole mess will be resolved TODAY!!!