Samsung Zflip Blank screen

Highly Disappointed in the Samsung Zflip phone we purchased on the 31st of December from the Vodacom store in Nelson mandela square Sandton city. We putchase the phone on the 31st. On the 5th of January i messaged the Sales lady to say the phone did not fall or anything. However the screen jus blacks out. 🙈 My husband took the phone back. And it suppose to be 7 days return policy. However they gave him back the phone and said they cant do anything and that the phone has a tiny tiny mark. Now till today the phone does this were the screen blanks out. What can be done. Is this how useless tge new Samsungs are and is the service from Vodacom just patgetic or what??? Its not fair. Brand new phones doing this., 😭