Is it possible to have damage repaired on my iPhone body (case)?

I've dropped my iPhone 6S on the floor and the screen has cracked, I'm having it repaired on Monday but I was wondering how much it would cost to have the body (case) repaired at the same time, as it has some dents and scratches on it?

Thanks for your help.

P.S. I'm talking about the phone itself, not a separate case

Why does my iPhone not charge?

I plug in my charger to my laptop and my phone goes "ON" "OFF" "ON" "OFF" really fast, so it isn't even charging. I'm an iPhone 5, latest iOS. I trust the computer as well but it keeps popping up with that.

Is Jailbreaking your iPhone okay?

I'm planning on Jailbreaking my iPhone 6, but I don't know if it would cause damage, like make it slow or freeze time to time. I seen it before on other people but I want to know what's on it and what can you do on it?

My iPhone 5c s screen works but sometimes it will go black?

The only way i can get it to work is to bend my phone until the screen starts to work again(it still "works" it's just the screen is black, and i know that it works because i can unlock it even when the screen is black and i here the unlock sound) , it will go back black at least once a day. What is this? Can I get it fixed?