Poor response on promises

On Wednesday the 17th of February 2016 I booked in my device for a warranty assessment at the mtn centre in Midrand, I was told it would take 4-6 hours to conduct an assessment on the phone upon which an e-mail would be sent granting the dispatch if a new device into my possession. The device was received by mtn at approx. 13:30 and no response has been communicated since, it is now over 24 hours later. I need the device to communicate with my employer as well as receive information regarding to my education and despite the device being put on a priority list no communication or update has been put forward by mtn.<br> I am dissatisfied by the empty promises made by the representatives regarding the timeline and the lack of response to my querie.