3 weeks....waiting with no return calls

I am now waiting for my Samsung 6 for over 3 weeks. I went into the Vodacom store on the 27th of August and was assisted by Venecia who ordered my phone. On the 15/09 i phoned to follow up and Avril told me my phone would be here by Friday the 18/09. I heard nothing. I phone again on 21/09 just after 9am and was told Venecia is busy with a client and will phone me back - no return call.After 5pm I phoned again and Avril again answered and said she would be get a supervisor to call me back within a few minutes. To date no call!! Really? I have been with Vodacom for over 20 years, worst service I have received to date.Why do you have a centre if you do not supply customer service and why do you offer a phone you cannot supply?