T mobile PRO IDENTITY THEFT

I went to open an account with T mobile only to find out that someone is already using my social security # on April of 2008. It is now almost September of 2009 and I am still dealing with T mobile. They are not doing anything about it. As well, I think its important to know as a consumer considering to do business with T Mobile that I also have a joint account with T mobile. I am a current customer and they still don't care enough to do anything about the individual who is using my social security #. I still cant open an individual account with t-mobile because someone else is using my soc.# with them.