iPhone 7 Black Screen?

My 32GB iPhone 7 had a heavy object dropped on the bottom left corner of the screen this Friday. 😢 At first, I assumed the screen was cracked, as there were random colours showing through some cracks in the phone while the rest of the screen remained black, but I took the screen protector off to find a seamless finish. 😕 I left it overnight and now the random colours aren't appearing, but the screen is still black. 😠

Does anyone have any idea of ways o fix it? 😟 I've already done a hard reset, but that didn't work. Otherwise, could anyone run me through the prices of repair? 🙂

If it helps, there is a small grey rectangle where the object was dropped on it. 😐 Thank you all in advance! 😀