由于我们工作的失误在L480/390244这个订单中多收了货款,共计$310.40（$12581.90-$12271.5）,会在下个订单L480/392416中返还.对于我们的疏忽感到抱歉.下次一定避免此类情况的发生.
We have overcharged a total of $310.40（$12581.90-$12271.5）for P/O L480/390244 by mistake and we will refund it in P/O L480/392416 next time.Sorry for our mistake and we can assure you that such incident will never happen in future.