i cannot joint this game
the email say i have multi acount ?
hey i never play this game before
i keep try agein and agein and keep get same message
how can i have multi acount if i never play this game ?

Multi accounts just mean that there is another account that uses the same IP address. If you access the internet at a public place, or use an ISP that rotates the assigned IPs etc then it will show up. Best thing to do is make a support ticket (Contact Support link at the bottom of the sidebar) and provide details there and an ASim will deal with your problem and fix it for you.