Before you ask the Apple Store for support, applying Joyoshare UltFix iOS System Recovery is the last and worthy solution that you can consider if the ghost touch issue is generated from iOS errors. This is an admirable repair program that can fix all kinds of iOS issues without the risk of losing data thorough the process. Not only that, but it is also capable of serving all iOS devices.
To be candid with you, Joyoshare UltFix is arrived with standard mode and advanced mode to address extensive iOS problems. As to those issues like ghost touch iPhone X, iPhone touch screen not working, iPhone black screen, standard mode can easily wrap them up with no data loss. Advanced mode works by restoring iPhone, so it is generally used to repair some complex issues. See here, why not benefit from it?
Key Features of Joyoshare UltFix iOS System Recovery:
Repair more than 30 types iOS issues
Support each iOS device, Apple TVs and iOS 13
Allow your iPhone enter/exit recovery mode for free