Hello,
I assume you can access outlook.com on a computer, not on a phone/tablet, right?
If so, go to www.outlook.com.
Once you are in, click on the gear icon on the upper right.
Then use this screenshot to guide you to get the language corrected first
Next, I suggest that you go through this list to make sure all other areas are reviewed:
Then, on the Mail tab, go to Rules. Are there any rules set up here? If yes, delete them all.
Then check the conditional format, again, if it's there, delete it.
Then, check Forwarding and IMAP, If any items are present, delete them as well.
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If you can't find anything, go to https://account.live.com > Your info > Sign in Preferences. Make sure to check all the aliases here. If you don't recognize any there, delete it.
Then go to Security > Manage How I sign in, make sure all contact info is yours. Then scroll down on the same page, look under App Password, click on remove existing app passwords as well.
Please make sure you change your password and enable two-step verficiation.
Go to your account online, go to Devices, remove any devices you don't recognize.
Then go to Security, click on Sign out everywhere. This is meant to kill any session that's still connected. Unfortunately, this one will take 24 hours to take effect.
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A lot of recent hacks I saw here in this forum was also caused by trojan virus from the computer. I suggest that you go here: https://learn.microsoft.com/defender-endpoint/safety-scanner-download
Download and run the 64 bit scanner, run a full scan. Tell me what the final results are.