请帮我翻译一句，英文

对不起，你付的运费有误，你只支付了一个运费，这样我会亏本,请再支付40usd,希望得到你的同意．请理解．
Execuse me, you pay of the freight have a mistake, you paid a freight, so I will suffer a deficit, pleasing then pay a 40 usds, hope to get your approval. invite comprehension.

Sorry, you pay the freight is wrong, you only pay a freight, so I will lose money, to pay 40 usds, hoping to obtain your consent. Please understand that.

Sorry, there was an error in your payment. You only paid trip fee, which makes me lose money in my business. Please pay 40 dollars in addition.
I hope you could agree and understand my situation.

Execuse me, it is the error from your transportation expenses,you only paid a single freight,then I will lose money in business.Pay another 40usd please,hope to get your approver.Please comprehension me,thank you.