How To Write A Letter For Credit Card . Given below is an example of the email format of the credit request letter. The details of the credit card have been enclosed. Pin on templates from www.pinterest.com Then skip a couple of more lines and add the company or recipient of the letter. Stuart, i am an account holder with your bank and would like to request you to cancel my credit card attached with the account number 66637992400492 as the credit card’s use has been discontinued as of january 7th, 2016 and have been destroyed. Use this sample credit card application request letter as a template for your formal request letter.