Which of the following statements should not be written in the same paragraph in a letter for making a strong complaint?
a. I hope it is not important to tell you again that this is the third time I have told about your staff.
b. If you cannot to do this, we will be forced to cancel your contract with us.
c. Three times this week, I have found your staff spent talking when they should be working.
d. I must insist, therefore, that you take immediate action to improve the quality of your services.