Have a look at:
https://support.xbox.com/en-US/help/family-online-safety/enforcement/xbox-enforcement-action-faq
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My Microsoft account was breached. When I switched on my Xbox, several unfamiliar profiles were logged into the console and the console displayed a device-ban message. My own Xbox enforcement history shows zero strikes and no suspensions. I immediately factory-reset the console because I was concerned about fraud, so the unfamiliar profiles are no longer visible. I contacted customer support but all I heard was "I am sorry but there is no way to contact enforcement team". Who and how should I contact someone who know what's going on!