DAMAGED phone/ NO STOCK

My cellphone (iPhone 6 silver 128GB) was faulty (factory fault) and I drove it to the HVRC in Johannesburg to get fast efficient service, which I got(received a ref number to get a new phone) but now my phone need to be replaced but NO branch of MTN in Pretoria/Johannesburg answers their CELL phone number, they do not even have land lines and they NEVER answer the cell numbers allocated to the branch. I then DROVE to two branches and waited to be assisted only to hear that they do not have stock! This is the forth day without a phone, they do not provide loan phones and my sim was taken out, so it is not working currentlly at all. I do not have any contact without my phone and drive a lot and without a phone it is a security risk. This is bad service and I request feedback from MTN or phone me to arrange a phone TODAY. Thank you [Email Removed]