It is with great reluctance that I must inform you that …

I regret to inform that …

Thank you for your … which arrived yesterday. Unfortunately, …

结尾常用句式

I would be grateful if you could…

I trust you will take my complaint seriously and…

I will apPciate it very much if you could…

I must have you fully understand that without a satisfying solution, I will reserve my right to take legal action.

Frankly speaking, I am not Ppared to put up with the situation any more.

On the condition that this one proves to be unacceptable, I will receive a refund.

I would apPciate it if you could…

I understand you will give immediate attention to this matter.

I look forward to your dealing with these problems without delay.

I would like to have this matter settled by the end of…

I shall be obliged if you will look into …

I understand you will give immediate reply to this matter.

If I must be constantly annoyed in this matter, I shall have to …