Poor aftersales service

Upgraded my contract and MTN and received a new device (I-Phone 7) Device worked for one week and then did not want to recharge or work, reported to MTN, was advised to return device complete with packaging and all components to nearest Store Sent to MTN East Rand Mall on 12 December 2020 and was advised to take it to an I-store to be assessed Took it to I-store East Gate and they tested device and stated device is a Dead Device and needs to be replaced and issued a report as such and was advised to take back to MTN Went back to MTN East Rand Mall and they said they need to send device to MTN repair center (booked in on 13 Dec 2020) Was advised that we would receive feedback within 21 days Contacted MTN East Rand Mall on 9 January 2021 and we were provided a No of repair center to call Contacted the number and they said they are waiting for phone as not yet received Contacted MTN store and they stated it was shipped to repair center in December After escalating to MTN store management they found phone was never sent as they found it on the rack in the store (dispatched on 20 Jan 2021) Contacting all for status and still no feedback