أبو فارس any issues that make it hard to touch on a specific region of the digitizer points toward a failed touch screen. You can try a hard reset (safe your personal files like music, pictures, etc since they will get erased. Check [http://www.hardreset.info/devices/lenovo/lenovo-a7000/|on here] for the instructions of a reset.
If that does not work, you most likely will have to replace the display assembly. [https://www.youtube.com/watch?v=NYa9nu0sj8E|This video] will help you with that.