投诉英文是complaint。
例句：
1、我要就噪音问题提出投诉。
I'd like to make a complaint about the noise.
2、投诉调查期间，这位警员被暂停职务。
The police officer was suspended while the complaint was investigated.
3、你可以向独立裁判投诉。
You may refer your complaint to an independent adjudicator.
4、最常见的投诉与服务差有关。
The most common complaint is about poor service.
5、我们接二连三收到了大批的投诉信件。
We have been bombarded with letters of complaint.
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