Is there any chance to work this on Android 4.4.4 Build: KTU84P.I9305XXUFNI3?
Can you help to root this version with safe root.
What happens when you try it? Given that it's a 4.4.4 build, it's probably running a patched kernel, which doesn't have the defect that Saferoot uses to gain root access.
Once the door is closed and locked (i.e. once the kernel is patched), you can't unlock it unless you can downgrade to an earlier release. You'll need to look for another rooting technique, such as Towelroot.
Better still, return the phone as unusable for purpose and demand an unlocked phone. In six months, my VZW contract is up, and I'm leaving. Why should I pay a vendor that refuses to meet my needs with a phone?