Poor after sales service

I have taken a black Friday special at Vodacom Westwood Mall on a 36-month contract on the Samsung S23 FE cell phone. After a few days I experienced some concerns with regards to the screen resolution and contrast as well as the poor battery life, so I decided to return the device to the store. The manager and the salesperson compared my device to other Samsung S23 FE’s in the store and they immediately saw the issue and noticed the poor resolution and camera and advised that the device needed to be booked for an assessment. Upon arrival at the repair Centre in La Lucia Durban, it was then determined it had to be sent to the Arc repair Centre for further evaluation. After a lengthy time at the repair center's, the verdict was the phone has no errors or issues. This is totally unacceptable, after 20 days of waiting to be given a device that’s up to standard I’m left grasping at straws and without a cell phone which I am paying for. Vodacom had the device longer than I did, why is it with them for such an extended period of time when I was advised it would take 3 to 5 days .I have to pay for a phone I do not have and I have used for just over a week. There are identifiable differences between the phone I was given and any other Samsung S23 FE in their store. According to the store manager they have advised the repair centre of their finding as it was visible as soon as they did the comparison that the phone was not up to standard. I have been a loyal customer with Vodacom for over 15 years and the way I have been treated is unacceptable, this goes against the consumer protection act and if this issue is not resolved and if i am not given a new device I will have no choice but to escalate this matter further.