Fix a black main screen (think broken)

I opened my phone the other night and noticed a green line going across the screen. I folded it shut and when I get home and opened it again it had a black spot in the mIddle of the screen by the green line. By the next day it got worse and now I came even you the inside screen. It won't function to touch or anything. And the camera 📸 disappeared and my settings app disappeared. K just bought these 2 phones about 3/4 months ago for me and my wife and they been nothing but trouble for us. Call 🦗 and they said call this number and I did and they said should be under warranty and on and on and on it goes. Please someone help me make a call. Is the phones junk or is there more to these little handheld computers. Thank you for your time.