my iphone 5s usb charger has broke easy can i have a replacement

Please make an appointment at the Apple Retail Store - Genius Bar and take it in for service. If you are not in the USA or cannot set up an appointment this way, then contact your local Apple Store directly. It will be replaced if it hasn't been damaged or misused and if it is still in warranty.

Possibly. See if your iPhone is still under warranty > Check Your Service and Support Coverage

If it's out of warranty, you will have to purchase a replacement > Power & Cables - iPhone Accessories - Apple

Find the serial number of your Apple hardware product - Apple Support