Dear [Company Name], I hope this letter finds you well. I am writing to express my disappointment and frustration regarding a recent purchase I made from your company. As a long-time customer of your reputable brand, I have always relied on the quality and reliability of your products. However, my recent experience with your [product name] has left me incredibly dissatisfied. First and foremost, I would like to address the issue of product functionality. Upon receiving the [product name], I was excited to utilize its features, which were highlighted on your website and in your advertisements. However, much to my dismay, I noticed several major flaws in its functionality. The [specific issue or defect] has severely impacted the product's performance, rendering it practically useless. Furthermore, the overall quality of the [product name] falls far below the standard I have come to expect from your brand. The materials used in its construction are flimsy and cheap, leading to premature wear and tear. As a loyal customer, I find it unacceptable to invest my hard-earned money in a product that fails to meet even the most basic expectations in terms of durability and craftsmanship. Moreover, I must express my disappointment with the customer service I have received throughout this ordeal. As someone who has been a patron of your brand for many years, I expected a higher level of support and understanding. However, the representatives I have spoken with have been dismissive and unhelpful in addressing my concerns. This lack of concern for customer satisfaction only exacerbates my frustration with the product itself. As a long-standing customer, I have always believed in the values and integrity of your company. However, this recent experience has shaken my trust. Therefore, I kindly request that you address this issue promptly by either replacing the defective [product name] with a fully functional one or providing a refund. It is my sincere hope that your company will take this matter seriously and strive to rectify the situation to restore my faith in your brand. Thank you for taking the time to consider my complaint. I trust that you will take the necessary actions to resolve this matter in a satisfactory manner. I look forward to hearing from you soon. Yours sincerely, [Your Name] [Customer Account Number, if applicable] [Contact Information: Phone number, email address]