IPhone 6 screen showing rainbow on left side of the screen?

I recently got my phone fixed at the mall after cracking it.
The phone was working fine until today. The phone is displaying thin vertices strips of rainbows acrid the screen and some of the screen is black. I did not drop the phone since getting it fixed.

Looks like the technicians who repaired the phone did something wrong. Take it back and ask for help/clarification.

No I don't think it is possible may be it can possible in future and while we talk about security, there's an app called Leo Privacy Guard on iPhone which is the most advanced security app.

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