The New Samsung Flip 4 Has A Black Line On The Screen

I bought the new Samsung flip 4 about 5 months ago and it has two year warranty with it. About one month ago i opened the phone and i found a black line inside the screen where the phone folds and the black color increases everytime i open the phone and close it , i was freaking out because I didn't drop the phone and i literally treat it like my baby because I spent all my savings on it, so i went to Samsung service in my area and they told me they will solve it , then one week later i received a message saying that i have to pay a huge amount of money to get it fixed , i tried to reach Samsung customer service in my area and everytime they give me a different representative to talk to and i keep repeating the same talk but all they say is "we'll respond back soon" , it has been one month since i left my phone with them and now the phone service they deal with sent me a message saying that they won't fix it and nobody from Samsung actually reached out to them , it's a big shame that they release the product and make commercials about and then when customers have a problem like this which by the way is a common problem as I've seen many youtube videos from people who had the same problem with this product then i really regret choosing Samsung.