I will try to say this in easy English.
First you say your friend used your account, and that your friend shot down his own team.
Rizkiridho wrote: I have the same problem my game name is HeavyShooter.my Account banned because i let my Friend play my Account when i'm trying to play my account was banned i ask him,then he said he shot down his own team.please fix this
Then you say you won't bomb or team kill anymore.
Rizkiridho wrote: I will never bomb my own hangar,team killing anymore.please unbanned me 
Then you go back to blaming your friend.
Rizkiridho wrote: My Friend play this game using my account
You bought the game. Then you lost your right to play the game, twice. After one problem, we un-ban players when we think they will not teamkill anymore. After two problems, it is hard to un-ban a player, because no one trusts them. Especially when you keep changing your story.
Maybe your story changed because you did not understand my English. But I believe that your story changed because you just wanted to apologize and be able to play again. It is difficult to trust you. I will ask the moderator group what to do here. I think you should be banned forever. They may be easier on you.
Manfred