請譯成英文~!~

Because you have bought, I cannot change the amount of goods, please pay me $2.5, I'll return to you!

網上交易關係,購買 和 付款是分開進行的~~~

已經購買了?- 還未付款應不算已購買

2012-05-04 17:58:18 補充：
please pay me $2.5, I'll return to you!---付$2.5又退回,是免費而不是改變物品的金額。是真的嗎?的確是很奇怪的交易！

Because you have bought, I cannot change the amount of goods, please pay me $2.5, I'll return to you!

Dear xxxxx

I am sorry that I cannot change price on goods already sold to you. Please be assured that I will refund US$2.50 to you after receipt of your payment in full.

Thanks for your kind attention to this matter.

Because you have bought it already, I can not change the amount of items, you pay me first, I then return $ 2.5 for you!

Since you have bought,I can't change the amount of it.
Payment first;then you step on to receiving us$ 2.5 to step up.

Because you have bought , I can not change the amount of items , your first payment to me , I then step back to 2.5 U.S. dollars to you !

Since you have bought it, I can't change the amount of items, your payment to me,I'll return 2.5 U.S to you!

Because you have bought, I can not change the amount of items, your first payment to me, I then step back to 2.5 U.S. dollars to you! 參考資料︰http://translate.google.com.hk/ (Google翻譯)自己[hope I can help you（希望幫到你），其他回答者請勿抄襲，其他回答者請勿參考或「抄考」，發問者請勿移除問題，其他網友請勿檢舉本答案]