I need help reversing/lifting a console ban

Console bans cannot be reverses.

If the console is banned, you would need to contact the person you bought it from for a refund. Console bans cannot be reversed.

If the console has been banned then you'll need to take it back to where it was purchased for a refund/exchange. Console bans are not reversed.

Sorry, but console bans are not reversed.

Can I still be banned if I purchased an Xbox console second-hand?

Yes. The warranty on a second-hand Xbox console is void, and the purchaser assumes the risk for any previous modifications or unauthorized activity. Even if the console’s ownership has changed, the console may still be subject to a ban. If you purchase a
console that has been previously banned you will not be able to connect to Xbox Live, and the ban will not be lifted as a result of the change in ownership. We recommend customers who believe they have not committed actions on the service to warrant a ban
to contact previous owners or users of the console.

You would need to try contacting the seller for a refund. Console bans are not reversed.