Trying to upgrade for the last 2 weeks

I have been trying to upgrade to a 16GB iPhone 6s plus for more than 2 weeks now. Every time I am told that I will be called back, and that they will do an out of store upgrade because I have driven their twice, all the way from Despatch, and both times their upgrade dept. were offline. Even though I phoned before going the second time and was assured that they are online. I leave messages for them to phone me, or when I do reach Cameron or Thanyiswa, they promise to sort it out and let me know, Which they never do. They also promised to have an employee who lives close by to me come and deliver the phone and the paperwork to me, so I can pay the fees and sign the documents. No news about that either...I have left 3 messages yesterday for Thanyiswa to phone me and she never did. I phoned 3 times today and either she was \out\" or busy with a customer. The person answering the phone promised that she would phone me back. It's now midday and I am at the end of being stuffed around. I feel I have been very patient with them but things are now reaching a point of ridiculousness. They must do as they promised and deliver the phone to me. They have so far just cost me money...."