帮忙用英语些一篇拒绝信

Dear XXX,
Thank you for being a valued customer of our supermarketc for so many years.I believe we have created a win-win situation and we all benefited from such relationship.
My supermarket is undergoing some changes at the moment,especially in credit sales terms and credit ratings.After a comprehensive review of your credit history,unfortunately,we decided not to trade you with any credit terms.
Should you have improved your credit ratings and wish to continue trade with us in the future,please contact us on or .
Kind regards,
XXX Supermarket