Samsung/vodacom won't replace out of box failure phones

Sunday I went to upgrade a contract at vodacom fourways mall and selected to go with a Samsung S21 ultra. This being their flagship phone. I was advised of a 7 day out of the box failure where the phone would be swapped out if there is anything wrong with it. That evening whilst setting it up it kept rebooting non stop and figured it might just be part of its OS . Eventually hours later after many failed attempts I was in and working. I went to bed waking up on Monday to see the phone had restarted . It then continues to restart constantly throughout Monday. I tried calling their number listed on their site to get advise and Noone answers. I thought OK let's do a factory reset. And had to go through the effort of setting up a phone while it rebooted constantly. Then came today. August 17th. It was so bad I couldn't type a message without it restarting . I then went back to vodacom. (2 days after getting the phone ) where they advised me I needed to book the phone in for a minimum of 3 days . Now in what world is this out of the box failure replacing?. So now I sit without a phone. It took me shouting and making a complete fool of myself just to get a loan. As I had given my old one to a family member to use. I DO NOT WANT A FAULTY PIECE OF JUNK SENT IN TO BE FIXED. I WANT A NEW 1 AND WANT IT NOW. you are quick to run debit orders and bill people . I dare you to try Bill me for a single day without the device

I will be back tomorrow name shaming you to all your customers as they walk in until I get my new phone