IELTS letter: Bad meal in a restaurant

You took your family to a near-by restaurant. You were disappointed with the meal and wish to complain to the manager.
Write a letter to the manager of the restaurant. In the letter
- explain why you were at the restaurant
- describe the problems
- write about the action you want the manager to take
Write at least 150 words.
You do NOT need to write your own address.
Begin your letter as follows:
Dear Sir or Madam,
Dear Sir or Madam,
On July 15th my family and I visited your establishment to have a traditional celebration of my sister’s birthday. Since she lives in France we annually go to this restaurant, because we always considered it as the most classy French cuisine place. Having the onion soup there is also our family tradition because my sister loved it very much before her moving to France. I suppose, you can imagine our disappointment when we found the onion soup absolutely inedible last time. Firstly, it was cold. Secondly, it seemed your chef did not stir it well while cooking, so there were some clogs of flour. The last but not the least, its taste made us to suggest that the cook used artificial instant soup base. We asked our waitress about the reasons soup is so awful and she told the cook of current shift has changed and this is the vision of the soup of the new one.
It is highly unlikely this new chef with his vision is suitable for such famous restaurant as yours. I recommend changing or sending him to training in order your customers could further enjoy genuine French cuisine.
Faithfully yours,
Anna Frank