Unfortunately, once an account has been banned from Xbox Live you cannot access any downloadable content that you may have had. When the account was banned all DLC was lost.
No only your xbox 360 will get bannd. You can get another xbox and recover your GAMERTAG on it. your account will not get banned !
you go on profile and then recover gamertag
Someone hacked it
It can get banned and therefore cancelled.
No.
It is possible to recover the 360 account on your classic xbox and vice versa. Just look for the "account recovery" option and type in the email and password for the account that you want to recover.
You would have to recover your gamertag onto your xbox 360 console again.
Yes, I do believe so.
About 10to20
By disconnected, I am guessing you mean banned forever. The way to fix that is make a new windows live account, wipe your xbox, and make a new xbox live account.
You probably cheated plain and simple.
If it is a Perma Ban, you will either have to try and dispute it or make a new account. Most likely make a new account. You can call XBOX's customer service to dispute it. If it is not a Perma Ban, wait. You obviously did something to get banned.