Help me contact...

There is not really a set person to go to, although if it is feedback you want to provide xbox does have an official feedback site to leave feedback on these types of things, here : https://xbox.uservoice.com

Thank you, I will do this now.

Although it would be nice to try and re-coup some of the lost funds from Microsoft.

If you cannot locate or access the account that has the subscription, then you need to speak with your financial institution and have them cancel the card and block further Microsoft purchases.

@Owen If you're friends with someone, or you're following them, a message will come up on your Activity feed that they have changed their name.

@Danny Hits This is from the "Managing your Xbox LIVE Account" Support page.

I heard old GTs are being re-added. When will "This GT" be available?

There is no schedule or estimated dates for when certain GTs will become available again. GTs are not an on-demand service. They will be available when they are available

http://forums.xbox.com/xbox_forums/xbox_support/xbox_360_support/f/12/t/153151.aspx#gt-avail

Also, the original owner of that name may have created a new account, and put the name there.

When I searched for the "Dan" profile, it said page not found, so it sounds like it's available right now.