I have not received my contract phone after upgrading

<p>I recently upgraded my contract on the 14th November 2017 and I was told that I am set to receive my upgrade my phone after 7 working days and till this day I haven't received my phone. I have called almost all the MTN customer are numbers there are. I have even spoken to the people at Mobile plus,They are also sending me back and forth and none of the courier companies can help me locate my phone or even tell me what they can help me with... I am honestly fed up with their disgusting service</p>