用英语写一封请求信今年10月1日买的电子词典用了一个星期就坏了 仔细阅读产品保证书后发现可以要求退款 随函寄去词典供检测,请求予以退款

Dear sirs:
I am writing to you to complpain about my newly-bought electronic dictionary on oct.1,which failed to work only after one week's use.Unfortunately,that dictionary is labelled with your logo.After a careful exam of the "The Product Quality Guarantee",I learned that there is the specific item dealing with my problem.The item enables any concerned customers of my kind to claim for a full refund.Therefore,I am claiming my rights ensured by this document and requesting for a full refund.
For your further examinations on the problem,attached to this letter is the dictionary I have mentioned above,.
I am looking forward to your prompt reply to my request.
Yours
Fatithfully
XXX