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He wrote in a letter of complaint to the King.

He was going to have to write a letter of complaint.

He said the town has received 33 letters of complaint just this summer.

She said the program had received about a hundred complaint letters.

A letter of complaint to the company has been ignored.

I've written a letter of complaint and they've promised to look into the matter.

He'd written them a letter of complaint, but they never replied.

Executives say they have never received a letter of complaint.

"You can write a letter of complaint," said the old man.

I receive many letters of complaint and concern about this.