FAULTY NEW IPHONE RETURN

On the 6th of June I visited Greenacres mall MTN store where I bought my phone to return the device as it is faulty. I am very unhappy because I spent the whole day there without being assisted the way I wanted instead I was advised that I must remove passcode and Face ID on a phone that is faulty for them to take it back. The device switches on and off within 2 to 3 minutes and I cannot connect to sim , so it was not possible for me to do this at all. Even if I try to do this faster it still gives me another error which requires an hour security delay before passcode can be reset. This as well is not possible because the phone itself cannot stay switched on for more than 3 mins therefore it restarts the security delay over and over again.

In addition, before I decided to return the phone I initially went to see a technician at istore in Walmer park who advised that I must return the phone to MTN they are unable to diagnose it since it switches on and off and the is no physical or water damage it could be main board failure

Finally, this is very frustrating to me as a client who bought a new phone with a reputable company. My life depends on that phone even for working purposes I am really unhappy it has been a week now without a phone. Above everything the phone was bought in February this year on contract not even 6 months has passed.