投诉信是一种非常常见的书信形式，它通常用于向某个组织或机构表达不满或投诉某种事情。下面是一篇关于投诉信的英语作文。

Dear Sir/Madam,

I am writing to express my deep dissatisfaction with the service I received at your restaurant last night. I visited your establishment with a group of friends and was extremely disappointed with the overall experience.

Firstly, our table was not ready when we arrived even though we had made a reservation. We were left standing in the entrance for over 30 minutes, which was unacceptable.

Secondly, when we were finally seated, it took an unreasonable amount of time for the waiter to take our order. We had to call him over several times before he finally came.

Thirdly, the food was of poor quality. The steak I ordered was overcooked and dry, and the vegetables were cold and undercooked. When we complained to the waiter, he simply shrugged and said there was nothing he could do.

Overall, the service we received was extremely disappointing. I would like to request a full refund for the meal, as we did not receive the service or quality of food that we expected. I hope that you will take this matter seriously and take action to address these issues for the benefit of future customers.

Thank you for your attention to this matter.

Sincerely,

[Your Name]