banned first time

When i first brought halo reach on the 30th day I had it I was on Commander Grade 2 so when I first made a xbox live account it took my rank and credits and its been seven months can someone help me please.
Gamertag-DaKnight2014

Unfortunately, your progress in Halo: Reach will reset if your account becomes an online account.
Sorry, buddy.

This was an intentional design by Bungie. Its a method of stopping boosters gaining higher ranks with offline accounts and then taking it online with all the armour and other unlocks. I’m afraid you will just have to play to get your rank back to where it was.

How do I get off credit banned its been seven months and still on it.