He fired off a letter of complaint.

他奋笔写了一封投诉信。

《牛津词典》

She expressed her disgust at the programme by writing a letter of complaint.

她写了封投诉信，表示对这个节目的反感。

《牛津词典》

Master Huang: Would you please type this letter of complaint?

黄师父：帮忙打印这封投诉信。

youdao

Dziekonski got out of his contract eight months into it, after sending Cintas a certified letter of complaint and hearing nothing back.

FORBES: Dirty Laundry

Mr Foster, a trustee of Auckland Castle, has written a letter of complaint about the proposed sale to the church commissioners.

BBC: Church plans art treasure sale

He sent a letter of complaint to his archdiocese, copying in the Vatican but bypassing Cardinal Ortega, according to people familiar with the letter.

WSJ: Two Clerics Differ on Cuban Reform