英语翻译

英语翻译
请帮我修正以下句子文法 附上中文 好让你们了解我想表达什麼
when i register this new semester Fall 2013 ,
i pay register fee online.but,i don't know why,
i have paid twice $30 dollars,for sure.
i remember when i pay the registeer fee is in the
forms of Dawson.the second time i pay the money was on my portal.
it's say something about balance fees!it's say $30 also.
is it possible to ask my money back?i pay the total $60,
i want my $30 back.
thanks for your understanding.
当我报名新学期2013的课程时
我线上缴注册费 但我不知道为什麼
我竟然付了两次$30 信用卡有刷了两次$30的纪录
我清楚的记得我是填完Dawson的报名表 後面付的
但第二次付则是在我的portal上 因为出现alance fees的讯息 一样是缴$30
所以我缴了
有没有可能把我多缴的钱 要回来?我总共付了$60
我想要我的$30 要回来