Vodacom and replacement after out of box failure.

New IPhone on an upgrade. Open box failure as phone goes into continuous restart. Take it back the next day. 10 days later have to go back to store self to get update n phone only to be told it’s now been sent to advanced repairs?? What does that even mean. The deal is if it does not work, it’s replaced after the being sent away. Changing the goal posts once again. Another 7-14 days? This is for a brand new phone?? Very little support and feedback from the service provider. 25 years of loyalty means nothing to them.