Caller: I don't know, and don't really care

Had a few calls from this number, First time it was a lady from Microsoft (ye right) claiming my Hotmail account is being used by (females name), and is this correct, I just said, thanks for letting know, and hung up, I now just let the answering machine waste their international calling $$$'s, but of recent, I have received a 2FA confirmation code. So not sure what's happening, and dont really care, low lifes.