Brand new phone disfuntional, poor testing in store now I suffer

Good day.

I took out another phone on my contract at the Brentwood park branch in Kempton park last week Thursday. We were told if there is a problem with the phone we have 7 days to bring it back to be replaced.. What a lie.. On Friday the phone started freezing, could not answer calls, got really hot, glitched or could not restart when holding the power button in. I then went to the Oaksfields branch as "Mama Lebo" was there as we were told that she could assist us. We showed Mama Lebo the issue with the phone, and she told us that we can bring it in on Monday (Yesterday) to get the phone replaced as it did not function the way it should. We took the phone in yesterday so the technician (John) could test it.

John told me that he factory reset the phone, made a few phone calls and could not find the issue with the phone. I asked him if he put applications on the phone (Whatsapp, facebook, tiktok etc..) like an end user would, he said that he did not. The testing to me was not done properly as he did the bare basic testing. We took the phone in this morning to show them how it does not make phone calls and how it glitches. They told us that John tested the phone and said there was nothing wrong instead of actually LOOKING AT THE PROBLEM IN FRONT OF THEM.. The lady at the store told us they would have to send it in for testing which could take 5 to 6 weeks..

I need the phone NOW as my partner gave her old phone away and is now left without a phone due to the incompetence of the staff at MTN Brentwood Park. We have missed parcels from couriers and import calls for work. Please can MTN rectify this as the phone does not function properly!!!