I just received a text message from "732873" that says that an email address I don't recognize has been added to my account, then a second text that says that my phone number is scheduled to be removed from my account. I didn't make any changes, so I'm not sure why information is suddenly getting altered. Has my account been compromised?

After receiving the texts, I logged into my account and changed the password, as well as cancelling the phone number removal and undoing the email addition. Is there anything else I should do? (Other than just close my Outlook account and use Gmail like everyone else.)