投诉信是一种常见的书信形式，用于向相关机构或个人表达不满和抱怨。在写投诉信时，需要注意语言准确、措辞得当，以使读者能够清晰地理解您的问题和要求。以下是10篇英文的投诉信范文：

1. 投诉信给银行

Dear Sir/Madam,

I am writing to file a complaint regarding the service I received at your branch yesterday. I arrived at approximately 2:30pm to deposit a check, and was met with an extremely long wait time. Despite there being several tellers available, the line did not move for nearly 30 minutes. When I finally reached the teller, I was met with a rude and unprofessional attitude. I was made to feel like an inconvenience, and my transaction was not handled efficiently. I expect better service from your bank, and would appreciate a response regarding how this issue will be addressed.

Sincerely,

[Your Name]

2. 投诉信给航空公司

To Whom It May Concern,

I am writing to express my disappointment with the service I received on my recent flight with your airline. The flight was delayed by several hours without any explanation, causing me to miss an important meeting. Additionally, the staff were unhelpful and dismissive when I asked for information regarding the delay. I believe that this kind of treatment is unacceptable and would appreciate a response regarding how your airline plans to address this issue.

Sincerely,

[Your Name]

3. 投诉信给酒店

Dear Management,

I am writing to express my dissatisfaction with the service I received during my recent stay at your hotel. The room I was given was dirty and poorly maintained, with stains on the carpet and a malfunctioning shower. When I brought these issues to the attention of the front desk, I was met with an unhelpful and dismissive attitude. I believe that as a paying customer, I deserve better treatment and a higher level of service. I would appreciate a response regarding how your hotel plans to address these issues.

Sincerely,

[Your Name]

4. 投诉信给医院

To Whom It May Concern,

I am writing to file a complaint regarding the treatment I received at your hospital. During my recent visit, I was subjected to a long wait time and unprofessional behavior from the staff. Additionally, the diagnosis I received was incorrect and caused further health complications. I believe that as a patient, I deserve better care and attention to my needs. I would appreciate a response regarding how your hospital plans to address these issues.

Sincerely,

[Your Name]

5. 投诉信给电信公司

Dear Sir/Madam,

I am writing to express my frustration with the service I have received from your company. Despite multiple attempts to resolve issues with my internet and phone service, I have been met with unhelpful and dismissive responses. The service I am receiving is not up to par with what I am paying for, and I expect better treatment from your company. I would appreciate a response regarding how this issue will be addressed.

Sincerely,

[Your Name]

6. 投诉信给政府机构

To Whom It May Concern,

I am writing to file a complaint regarding the services provided by your government agency. Despite repeated attempts to obtain information and assistance, I have been met with unhelpful and dismissive responses from your staff. This lack of support has caused undue stress and frustration, and I believe that as a taxpayer, I deserve better treatment. I would appreciate a response regarding how your agency plans to address these issues.

Sincerely,

[Your Name]

7. 投诉信给教育机构

Dear Administration,

I am writing to express my concern regarding the quality of education provided at your institution. Despite paying a high tuition fee, I have found that the teaching staff are unqualified and the curriculum is outdated. I believe that as a student, I deserve a higher level of education and support. I would appreciate a response regarding how your institution plans to address these issues.

Sincerely,

[Your Name]

8. 投诉信给零售商

To Whom It May Concern,

I am writing to express my dissatisfaction with the product I purchased from your store. The item was faulty and did not perform as advertised, and I have been unable to receive a refund or exchange from your staff. I believe that as a customer, I deserve better treatment and a higher level of service. I would appreciate a response regarding how your store plans to address these issues.

Sincerely,

[Your Name]

9. 投诉信给旅游机构

Dear Management,

I am writing to express my disappointment with the travel package I purchased from your agency. The accommodations were subpar and did not meet the advertised standards, and the tour guide was unprofessional and unhelpful. I believe that as a paying customer, I deserve a higher level of service and satisfaction. I would appreciate a response regarding how your agency plans to address these issues.

Sincerely,

[Your Name]

10. 投诉信给汽车制造商

To Whom It May Concern,

I am writing to file a complaint regarding the vehicle I purchased from your company. Despite being a relatively new model, the car has experienced multiple malfunctions and safety issues. Additionally, the service I have received from your dealership has been unhelpful and dismissive. I believe that as a customer, I deserve a high-quality and reliable product, as well as appropriate support and service. I would appreciate a response regarding how your company plans to address these issues.

Sincerely,

[Your Name]