Letter of Complaint how to write and samples

Opening Remarks:
Mild:

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  I am writing to complain about/ regarding/on account of/because of/on the subject of ...
  
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  I am writing to draw your attention to ...
  
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  I am writing to you in connection with ...
  

Strong:

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  I was appalled at
  
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  l want to express my strong dissatisfaction with
  
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  l feel I must protest/complain about…
  

Closing Remarks:
Mild:

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  I hope/assume you will replace
  
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  l trust the situation will improve
  
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  l hope the matter will be resolved
  
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  l hope we can sort this matter out amicably
  

Strong:

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  I insist you replace the item at once
  
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  I demand a full refund
  
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  l hope that I will not be forced to take further action
  

Letters of complaint sample 1
Example Letter of Complaint: Complaint about poor service:
Sir/Madam,
I was a customer, along with several friends, at your restaurant last week, and I am writing to complain about the treatment we received.
The manager was extremely rude to us from the moment we entered the restaurant, and we had to wait almost half an hour for a table, although we had booked one.
Having ordered our food, we were kept waiting almost an hour. When it finally arrived it was so badly cooked that we had to send it back. No apology was offered for...
Letters of complaint sample 2
Example Letter of Complaint: Complain to neighbor:
Dear Mr. Moncton,
I am writing to complain about the two Alsatian dogs that you own.
Although I have repeatedly asked you to prevent the dogs from leaving your garden, you have failed to do so. As a result, my front lawn has been dug up twice over the past three days.
Furthermore, their continual barking is...