►I am writing to express my dissatisfaction about…
►I write to make a complaint about…
►I would like to draw your attention to the problem that…
►I feel sorry to trouble you but I am afraid I have to request you to take corrective actions concerning…
►I regret to inform you it absolutely disappointed me that …
►To be frank, in the first few weeks, I got on well with… However, recently, I have discovered that…
►This has put us to great inconvenience. Therefore, I am returning... and would greatly appreciate if you could replace it.
►I am totally upset with… and can not tolerate anymore.
►To my great regret, they become troublemakers and affect my life seriously.
►Honestly, at the beginning, I was quite satisfied with your service. To my great disappointment, yesterday I found that…
►To solve this problem, some remedial actions should be taken before things get worse.
►To solve the unpleasant matter, I suggest making the following changes.
►I shall be grateful if you could consider my situation and improve it as soon as possible.
► I trust you will take my complaints seriously and look forward to hearing from you soon.
►I understand you will give immediate attention to this matter and reply at your earliest convenience.