my retina display slightly crushed and it shows some broken line on its down line.what exactly i need to do?

Dude, your retina display is gone for good. The only viable solution will be to get the whole display assembly replace for around $700 (Prices may vary slightly from person to person during quoting) from Apple as accidental damages are not counted in warranty. Sorry for the loss..

Could you post pictures?

Also:

It will make it easier to help you w/ your problem to know the exact model, size, year built, RAM installed and OS you're running.