Well, I don't why I can't change my Gamertag.

The free gamertag change is only available if you were given a randomly generated tag when you created your account and are changing that tag for the first time. If you have one you chose, then you have technically already used your free change and would
have to pay to change it.

You can go to http://support.xbox.com/contact-us to contact support, but they wouldn't be able to bypass the fee.

Your tag has to be a system assigned tag. If that is your gamertag it doesn't appear to be a system assigned tag.

Good afternoon,

You can go through the Xbox Support
here. They also have phone numbers to call in case you want to talk to a representative.

I hope this helps,

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Hi there Karma,

Thanks for reaching out. I'm sorry to hear about the issue with changing the Gamertag on your account. Take a moment to review the article:

How to change your Xbox gamertag

I recommend to
contact Customer Support for
further assistance.

Try this:

• Log into Support.Xbox.com
  
• Scroll down, Click on Contact Us
  
• A new window will pop up
  
• Type in contact Support - you will receive different options, such as:
  
  • Message with an Xbox Gamer
    
  • Call me back
    
  • Ask the Community
    

Hope this helps.

Hi there !

I don't know how to contact the support by mail, so... Here I am !

I never, ever, changed my Gamertag, since I was playing on my Xbox years ago.

It's said that you can change it for free if you didn't choose it. At least, that's my case I think. The one I wanted years ago was taken, Xbox tell me to take the actual one. I kept it for many times, now I'm back because of SoT, but my gamertag feel a
bit oldy too me.

So, why is the Windows charging me 10 bucks now ? Should I not be able to change it for free ?

And how do I contact the support ?

I guess the question when you originally made you tag, did you enter in a gamertag even though your preferred one was taken? While you do have the ability to change your gamertag once at no charge, that is only if the gamertag you have was one that was
a generic one provided at the time of creation. Depending how old your gamertag is, you may have created it before that system was implemented meaning you do not have an option to change your tag for free. In that case that price you see is the standard
cost if you wish to change you Gamertag.