It looks like someone else may be using my account? Please help, I have tried every option.

My Xbox live account is linked to one of my emails but I can't log in because apparently someone else is using it. I can't receive the security code as it gets sent to the same email which is blocked (which I think is really stupid and Microsoft should do something about it) and every time I reset the password after filling in the details, when I try logging in, I get the exact same message "It looks like someone else may be..." 
Please help as I have exhausted all options and it has come to my attention that the only way to actually solve this problem is to get help from a Moderator who works for Microsoft. 

Thanks.