Account seems to be hacked

I tried to sign in and was told the password was wrong, then went through the form submitting extra info and was emailed on my other address to be told that I  did not provide enough information to access the account but the email account this reply referred to was not the one I have, it was 'Koebenhavn' at outlook dot com, tried this twice and it is still calling my account a different email address, really strange, so no access- help!