my console got banned

Xbox Live device bans are not lifted. There is no way to appeal them, because they are only issued if something really serious is done.

XBLSF Delta

Sign in with your account at enforcement.xbox.com and it will tell you why you were banned. You can also check your email associated with your account and it should tell you why there as well.

https://enforcement.xbox.com/en-US/home/codeofconduct

A violation of the Microsoft Code of Conduct may be cause for these or other actions:

• Automatic assignment of a new Gamertag, if you create an inappropriate Gamertag.
• Content deletion, if you create or use inappropriate Content.
• Restrictions (e.g., communications, multiplayer, account access) on your use of Xbox Live services, if you abuse those services.
• Permanent suspension or device ban, if you commit an egregious violation that includes, but is not limited to: hacking, modding, profile tampering, fraud, trading or stealing accounts or Gamertags, severe racial remarks, impersonating Xbox
  staff, displaying nudity, repeatedly creating inappropriate Gamertags or profile content, distributing URLs to phishing sites.
• Permanent suspension or device ban, if you try to avoid suspension with alternate accounts and/or devices.
• Permanent suspension or device ban, if you repeatedly commit violations.

Hi there,

Only an enforcement team member can respond to any enforcement actions issued and they do not use the forums. You'll need to visit
https://enforcement.xbox.com to get any information.

Device bans are not issued lightly, and occur when a particular Xbox console or Xbox on Windows device is used to violate the Code of Conduct in an egregious or repeated manner. Once a device ban occurs, no account can connect to the Xbox Live service from
the affected device. Given the severity of this action XBLPET takes each device ban extremely seriously, and only take action after a lengthy investigation.

Please note that banning an Xbox console or Xbox on Windows device does not disrupt the underlying functionality of the device, and it can continue to be used offline following the ban. For more information about using Xbox One offline, visit
xbox.com/offline.

You can't file a case review for a banned console.