mygamertage and passward were changed some how by someone else

I logged in by having to reseting a passward sent to my phone! due to the my original passward not working!

The new gamertag was a result of your account being issued a Forced Name Change due to having an inappropriate gamertag. If the password was changed, how are you logging in?

Hello There HappyFoal378143 Now it`s a good idea to increase Account security because It`s one of there top priorities at both Xbox Live and Zune but It`s your responsibility to
keep your account and information protected at all times. Make sure to follow the Five steps.

How to Protect your

Microsoft Account
Account security is one of our top priorities at Microsoft. Follow this checklist to make sure your Microsoft account and PC are as secure as possible.

Five steps to take now:

• Add security proofs to your Microsoft account
  
• Get the latest security updates for your browser and PC
  
• Update your virus, spyware and malware protection software
  
• Turn on your browser phishing filters
  
• Create a strong password
  

These five steps cover the basics of improving security on your Microsoft account. To go beyond these basics, and do more to protect your family and account information, visit
the additional security steps here.

Now about your Gamer-Tag I`d like to say it could have been a Forced Gamer-tag change Due to the
Violation of the code of conduct. I`d like you to find out at 09 - Xbox 360 Account Suspensions & Console Bans they deal with Inquiries about account suspensions, forced Gamertag changes, console bans, and other enforcement
actions. Explain about your Gamer-Tag change and they will look into it.

When a forced Gamertag change (name change) is imposed, the system will automatically pick a new Gamertag for the user. A forced Gamertag change is imposed when a Gamertag is determined to be inappropriate by the Xbox Live Policy & Enforcement Team. Examples
of inappropriate Gamertags include names that visually resemble, sound like, represent, hint at, abbreviate, or insinuate any of the following:

• Profane words or phrases
• Topics or content of a sexual nature
• Hate speech (including but not limited to racial, ethnic, or religious slurs)
  
• Unlawful drugs or controlled substances
• Unlawful activities

I checked and there is nobody that has the same user name as me

If it's giving you a suffix then its definitely in use.

Keep in mind the gamertag system doesnt see captilizations and spaces as making a gamertag unique so when changing your gamertag it would see "MyGamertag", "My Gamer Tag" and mygametag" all as the exact same gamertag.

When you are seaching manually to see if someone has a certain name or not you have to search for it EXACTLY as they have it otherwise itll say no one has that gamertag even though someone might actually have it but just with different captilizations or spacing.

For example lets say you are wanting the gamertag "MyGamertag" and you search to see if someone already has the gametag of "My Gamer Tag" itll say it doesnt already exist.

When you go to actually change your gamertag to "MyGamertag" it knows "My Gamer Tag" already exists and it will therefore put a suffix at the end of the gamertag you want.

Hopefully thats not too confusing but that's essentially how that works.

Tldr: if its giving you a suffix then someone DOES have the gamertag you want but could just have any number of combinations of changes between the captilizations and spacing.

case and spaces do not count towards a difference

Mygamertag

My Gamer Tag

MYGAMERTAG

All are considered to be the same tag.