"I have a non responsive touch screen. Can I recover my data?"に関する回答You can try connecting the phone to the computer and transfer files to the PC or you can use some third party utility to create backup.
"Phone stuck on Android is starting screen"に関する回答If your phone is fully charged, then you can try contacting the manufacturer or service center
"Broken internal cable from speaker to headband."に関する回答I doubt if this can be repaired on your own. Yes, you can ask for replacement if the product has replacement guarantee etc.