Once you've changed the account region you will need to wait a full 3 months before you're able to change the region again. This is stated in the region change FAQ located
The only way that something like this could possibly be undone is if your account was compromised. If that was the case, you'd need to contact Xbox Support via phone and ask them for assistance in regards to changing the account region before the 3 month period.
You can reach out to phone support by visiting this page here.
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