You can play from your Xbox One and you can get your account modded and have the stats transfer over to the Xbox One.

Now, if you're looking for a quick way to just level up, there's a glitch involving a video in the theater of the game. There's probably a few videos on how to do it on Youtube, you might wanna check that out.

If that's too much work for you, you're going to have to get a recovery done by the stickied users at the top of the CoD Forum.

I can get you 15th , everything unlocked apart from attachments - Online too and free of course