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The phrase "letters of complaint" is correct and commonly used in written English.
It refers to a written communication that expresses dissatisfaction or disapproval with a product, service, or situation. Example: I have received several letters of complaint from customers regarding our recent product recall.
Exact(59)
Expect more letters of complaint.
Mostly, people wrote letters of complaint.
61 Write letters of complaint.
I am writing letters of complaint.
Many letters of complaint ensued from flight attendants.
The USDA got no fewer than 275,000 letters of complaint, and was visibly rattled.
(Attention, Irish people and pirates: please send your letters of complaint directly to New Hope).
This piece was widely acknowledged to stretch the truth; letters of complaint poured in.
The Shandong Province party committee reported on Aug. 10, 1959, that it received 266 letters of complaint early that year.
After speaking to a local judge, Crawford learned that letters of complaint had been arriving from drivers across the country.
As a sideline, he types letters of complaint to government agencies, the city's mayor or even to the president himself.
More suggestions(15)
letters of submission
letters of opposition
letters of application
letters of credence
letters of vision
letters of confirmation
letters of recommendation
letters of recognition
letters of consent
letters of apology
letters of concern
letters of authenticity
letters of introduction
letters of solidarity
letters of agreement
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com