It looks like someone else might be using your account – existing solutions no use

I have tried the solutions -- provided in http://answers.microsoft.com/en-us/windowslive/forum/signin/i-cannot-sign-into-my-account-what-can-i-do-to/3fa23b8c-dd07-4dfc-851f-e7cef7bda1bd -- that I can use right now with my other account being blocked, but it was all in vain. I've submitted the questionaire several times but was always told the answers were not correct! At other times the security questions are unreadable codes. What can I do now?

Besides, I set up a Yahoo China account as a backup but yahoo.com.cn is not providing email service anymore. Why did I get no email alert asking me to change it? Now I'm trapped.