找了一个范文,你看看参考一下吧Dear Sir,On 5th October I bought one of your expensive "Apollo" fountain pens (n.钢笔) fromJulian's, a big department store of this town. Unfortunately I have been unable to use the pen because it leaks(v.漏水) and fails to write without making blots(n.污点). I am very disappointed with my purchase.On the advice of Julian's manager, I am returning the pen to you and enclose it with this letter for correction of the fault.Please arrange for the pen to be fixed or replace it with a new one and send it to me as soon as possible. 敬启者:本人于十月五日在本市的朱利安大百货公司购买了你们出产的名贵“阿波罗”型号钢笔一支。但遗憾的是,我一直未能使用这支笔,因为它漏墨水,一写字就漏出一滴滴墨水污渍。我对所购买的产品非常失望。现按照朱利安百货公司经理的意见,我随信把这支笔退还给你们,以便你们设法补救。请你们安排修理此笔,或换一支新的给我,并望早日寄来为盼。