iPhone XS ghost touch

I'm using an iPhone XS. some months ago, it began getting crazy, swiping and pressing random apps and buttons on its own. it makes videphone or calling, delete apps. I've tried also to restore as new device. no luck. problem appears sometimes not always. The device has no physical damages, no jailbreak. i’ve tried to go 2 times to apple store in rome (euroma 2) and i was very disapponited with assistence, they told me that problem was not clear in that moment, they could have change display ( i should have payed the repair) but with no warranties about other possible hardware problems. what kind of assistence? shouldn’t they find the issue and repair it? i can pay all that you want but i should be sure to resolve issue. i’ m out of warranty of some months. no luck for who is out of apple care unless you decide to spend a lot of money in changing components or buying new devices. also it seems this ghost touch issue happens very often, shouldn’t they consider it?

[Re-Titled by Moderator]