can I see a picture to know its real

I have a good idea as for what you done, in order to fix your classes you'll need to re-do this. I had done the same thing and when I went to the multi-player tab, Xbox LIVE I received a message informing me that my stats were reset, however nothing was effected.

This seems to only happen when you're prestiged, but here's how to fix everything:
1). Log into Black Ops 2.
2). Load the multiplayer menu up and as soon as you do scroll down and select the system link option, you are then to create a game.
3). Quickly select Create a Class, then the first class.
4). You should shortly after hear a sound notifying you that you've signed into live.
You'll also see the game version update.
5). Back out after hearing this and select Xbox LIVE. It should notify you telling you that your stats have been reset, however it will effect nothing.

This can be abused, and you can receive camouflages for guns you have never used, this is the same for attachments, weapon unlocks, titles and emblems. Be careful with this as you can reset your stats and you'd have to contact Player Support and have them reset it to your previous rank.

Warnings: If you are disconnected from live while doing this, it will reset your stats. You must do this quickly, but not too fast. Based off of experience this only seems to work for prestiged accounts, however I did not put this through extensive testing. This will mess with your custom classes, if you get a gun in your tactical slot it'll cause your Xbox to freeze and you'll have to re-do this.

Best of luck to you.