Imagine you have bought something faulty. Write a formal letter of complain (150-200words) to the shop or website. Follow the rules of formal letter and this writing plan:
Introduction: say what the item is, and where and when you bought it.
Main body: explain in detail what the problem is.
Conclusion: tell the company you are returning the item. Ask then to repair it, exchange it or return your money.
Don‘t forget to count words at the end