英文 email - 想話俾客人知道收到 PO 訂貨的價錢不正確. 請客人更正 PO. 點寫?

Dear Mary,

Thanks for the encl PO No XXXX which you send to us on (date). However, we found the unit cost is incorrect. Could you pls revise & resend it to us?

Thanks & nice to have your reply asap.

B.rgds/XXX (yr name)
(title)
(company name)