Small part of the screen does not work after screen replacement

Hello,

I have an Iphone 6s, i dropped it and smashed the screen.

I had the screen replaced.

the screen looks great and all but about 25% of the screen is unresponsive, literally like a strip does not work. If you are to count from the left to right their are 4 icons across the screen the strip is the third icon from the left and stretchers vertical across the whole phone.

Is this just an install issue or new screen issues or is my phone more damaged then i thought?