Samsung Zflip not good

I bought Samsung Z flip 3. The phone make a buble and black mark on the fold, the black mark is not on the screen ONLY there where thw phone flip.. The phone is less then a year... Now the repair Centre quote me R9800 to fix the phone.. I feel this is a mechanical problem cause if the phobe fell why the whole should be black or cracked... I am also a Sales Consultant at a mobile store and do have a lot of customers always ask how is the phone cause the need to upgrade. My answer will be my experience and that is that... Moral of the story im not the only one, we have three clients booked they phones in for the same issue.