Faulty new handset from Woodmead store

I received an upgrade phone (SamsungA73) on 31/10/22. I tried to transfer my contacts from my Iphone, but the contacts disappeared overnight. I returned to the store the next day to report this and the person at the store said he would transfer the data correctly. The sane thing happenned - most of the contacts vanished overnight. I have been back to the store more than 10 times in the first 7 days of having the phone and asked for the handset to be replaced. Lucas, the store manager said it was not possible. I then went to have surgery in 9th November and went straight from hospital to the store on Sat 11th . Lucas was not there. The area manager, Paolo was contacted and he reloaded the contacts saying that he changed some settings. The contacts disappeared again. He said he would come past me to pick up the phone today, Monday. He has not done that. I have asked for a new handset or for the upgrade to be cancelled within the 7 days but neither has happened. No one at the Woodmead store reported the problem with the phone to the area manager or head office. I assume I will now be charged for a phone that I am unable to use. Tomorrow I will have to go and spend R10k to buy myself a phone that will work. I have been an MTN customer for close to 35 years - clearly MTN does not care about customer service.