Letter ofApolog Missing an appointment or a meeting or a deadline or doing something wrong can slow down a business relationship or even damage your business reputation and credibility. Sending a letter apology is one of the first steps in repairing any damage that has been done. In your business letter of apology, accept responsibility if you are at fault and attempt to reschedule or do some readjustments. :If you or your company made a mistake, write a letter of apology to show your honesty and credibility and maintain. a good relationship with your customers.Missing an appointment or a meeting or a deadline or doing something wrong can slow down a business relationship or even damage your business reputation and credibility. Sending a letter apology is one of the first steps in repairing any damage that has been done. In your business letter of apology, accept responsibility if you are at fault and attempt to reschedule or do some readjustments. If you or your company made a mistake, write a letter of apology to show your honesty and credibility and maintain a good relationship with your customers. Letter of Apology