No feedback

I have claimed for a new phone, I have been calling the call centre for 3 weeks now, I have spoken to different agents, the last one I spoke too, was rude and shouting at me her name is Berverly I ended up asking her to transfer me to a manager but she hanged up the call. I phoned again spoke to Andile who then transferred the call to Diana Kruger the manager. Diana had promised to give me feedback regarding my claim but she has not done so. Today 09/7/2018 I called the call centre and asked to speak to her she promised she was gonna call me back, I called again and they said she's on the other line with the customer. I then called again for the 3rd time I was told she went to a meeting and will be back after 16h00. I am very frustrated and fuming right now the service is really bad, I do not have a phone and I don't know what to do.