Used Console Parental lock please help

You would need to contact support.
support.xbox.com/contact-us

For second-hand consoles with parental controls already on them, you will need to call up Xbox support (US callers: 1-800-4MY-XBOX) to help reset the parental locks.

There is a unique button code you press somewhere on the System settings menu, which resets the parental locks. The Xbox representative will ask for your console's serial number and tell you what to press.

Good luck!

Hey there, so where did you ask why it was banned? If you make a post here it the XBLPET will be able to tell you:

forums.xbox.com/.../2366.aspx

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If you have already made a post there and they have stated there was no enforcement action on the console I would contact Xbox phone support:
support.xbox.com/contact-us

If you don't know the code to disable the parental control lock on an Xbox 360 console, you can always call up Xbox Support to have them help you reset it.

Last I remember, there's a secret button code you input in the system settings menu. The code is unique to every console. Provide the customer representative your console's serial number, and they'll walk you through the steps on resetting the parental lock.
Lots of people also do this when they buy a used console with a parental lock on it as well.

If you live in the US, the phone number is 1-800-4MY-XBOX. You can also chat with a support agent

here.

Thank you for contact us! I'm Anderson, an Independent Consultant and a Microsoft user like you.

good evening

Hi Roger from Wolverhampton,

I'm sorry to hear that you're having trouble removing the parental lock from your Xbox 360. Here are a few steps you can try to remove the parental lock:

Try the default parental lock passcode: The default passcode for Xbox 360 parental lock is "0000" or "1234". Try entering these codes to see if it unlocks the parental control.

Reset your Xbox 360 to factory settings: This will erase all data on your console, including the parental control settings. To do this, go to "System Settings" > "Storage" > "All Devices" > "System Items" > "Hard Drive" > "Reset System Settings".

Remove the parental lock through your Microsoft account: Go to your Microsoft account on a web browser, select "Devices" > "Xbox Consoles" > "Manage" > "Remove Console" to remove the parental lock from your Xbox 360.