ผมซื้อเกมผ่าน steam ด้วย mastercard ไม่ได้ครับ มันขึ้นว่าบัญชีถูกปฏิเสธครับ พอจะมีวิธีแก้มั้ยครับ 

" Your purchase has not been completed. Your credit card information has been declined by your credit card company.
Note that in some cases, your credit card company may put a 'hold' on funds in your account, but you will not be charged. After correcting any errors in the information displayed below, please try your purchase again. "