We're excited to announce that we've fully migrated the Xbox Forums to their new home, here on the Microsoft Community forums!
As of today, going to forums.xbox.com will redirect you here to the Xbox area of the Community forums. We've moved all of your existing threads over so you can continue and start conversations with the new forums experience.
We sincerely appreciate the feedback you have provided over this transition and can't wait for you to check out the new Xbox Forums!
I would head back to the site that told you this would work and tell them that it no longer does.
There is nothing about your gamertag that breaks the rules, so you wont be getting a free name change.
What you need to do if you really are getting hateful messages is to file a complaint against the people through your console and then mute and block them. Instructions on how to do both can be found behind this link