我想对这个产品提出投诉。
wǒxiǎng duì zhègè chǎnpǐn tíchū tóusù 。
I want to file a complaint about this product.
如果你对服务不满意,可以投诉。
rúguǒ nǐ duì fúwù bù mǎnyì , kěyǐ tóusù 。
If you are not satisfied with the service, you can complain.
他的投诉没有得到重视。
tāde tóusù méiyǒu dédào zhòngshì 。
His complaint was not taken seriously.