How to resolve a LCD with weird glitchy display?

I got a new LCD and got it changed. The first few days it worked perfectly but then some glitches started coming in images. Then it spread throughout. I formatted my phone but nothing worked.Then I changed my display settings from brilliant to standard and phone went back to normal. But again it slowly spread to rest of the areas and again its all glitchy. Also if a glitch is there in an image or text file, then the glitch moves with the content and doestn remain static at some specific part of the screen.