I'm writing this letter in purpose of complaining about your after-sale service.
我写这封信要投诉你们的售后服务。
I was very concerned when I received your letter of yesterday complaining that the central heating system in your new house had not been completed by the date promised.
昨天收到你的来信，抱怨你新家的中央加热系统未按规定时间装好，对此我非常关心。
I was very concerned when I received your letter of yesterday complaining that the central heating system in your new house had not been completed by the date promised.
昨天收到你的来信，抱怨你新家的中央加热系统未按规定时间装好，对此我非常关心。
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