Regarding the credit card transaction on the other day, please check just in case whether it is a double charge or not. If it is charged double, please refund.
With regard to credit-card transactions last time, please confirm whether you don't charge me two times just in case. And please refund for the difference if you do.
In regards to the credit payment I made the other day, could you please reconfirm whether or not there was a double-charge? If there was indeed a double-charge, kindly credit my account.
ありがとう。
チップありがとうございます:)