完整原文
I am writing to formally complain about a defective product I purchased from your online store last week, which did not meet the advertised quality. Specifically, the wireless headphones arrived with a cracked casing, and the right speaker produces no sound at all after only one day of use. Therefore, I am unable to use them as intended, and I have already attached the photos of the damaged item along with my order confirmation as proof. Consequently, I would like to request a full refund or a free replacement, and I kindly ask you to process my case within five business days. Thank you for your time and attention, and I look forward to a quick and satisfactory resolution to this matter.