SAMSUNG S21 ultra out of box failure

I upgraded to a Samsung S21 Ultra on 24 August 21. Returned to Vodacom Kollenade within 24 hours due to the phone not functioning. Battery depleted in a matter of 3 - 4 hours even in standby mode. Transfer of data to new device extremely slow. Consultant did software upgrade and sold me a fast charger for R799. I tried again and after 48 hours the consultant agreed that there was a problem and sent the phone for OBR out of box repair. I received an sms stating it was sent to and advanced repair centre and after 14 days received an sms stating the device would be ready for collection within 3 days. I refused the repaired device and demanded a new phone. Vodacom informed me that Samsung denied the out of box failure and said they did nothing to fix the phone. Can someone assist with this matter?