You purchased a mobile phone and after 7 days of use, you find functional errors. You write a letter to the company to replace the mobile phone as your case is covered in warranty period. But you don't hear back from the company. Now you have to write a letter to the company, reminding them about the problems you mentioned in your first letter. As a BBA student, I want this letter to be a business letter, which means it should contain business terms. Someone please help me as soon as possible.