My online profile is missing

Hi i need help with something. I have just got xbox 1 month free trial and i started it yesterday. all this time i have been playing offline and have made it as far as becoming a major. But i have lost that now since i started xbox live because i had to sacrifice my credits for some reason. how do get my offline profile back?

If the gamer tag was only on your xbox, and you never even made it a silver account (never played on that account while connected to live), and you deleted it, it is gone forever.

Gamertags are unique to an xbox unless it is played online, then it is saved forever. If you didnt play online, then your xbox had the only knowledge of that gamertag, so if its gone, its gone.