Why is the notifications bar, keyboard and screen keep flinching

My huawei mate 8 screen got broken and i changed both the display and touch screen because i was told it would be dangerous to only change the touch screen, as my phone had 50/50 chance of surviving.

The screen got changed but the screen kept malfunctioning, the keyboard, each time i typed the keyboard, some letters would be typing itself but not really typing (some people call it ghost typing)

The notification bar and mobile data measure would be fast and it would be repeating the same numbers like 3 times before changing to a new one

And worst of all when i open an app or a system, it would repeat three times before finally opening

I've taken the phone back to the repairer but nothing solves it. After the repairer fixes it, it would be normal for some minutes then all the problems come back worse.

Please help me, it's really annoying, what can i do to stop this, some people are twlling me to clear my system cache but my volume up button is damaged ?

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