When writing an apology letter to a customer for a defective product, it's essential to express genuine regret for the inconvenience caused, provide a clear resolution plan, and assure the customer of future improvements. Maintaining a polite and professional tone throughout the letter helps in conveying sincerity and commitment to customer satisfaction.
Sample Apology Letter to Customer for Defective Product
To,
__________ (Name of the Customer)
__________ (Customer’s Address)
Date: __/__/____ (Date)
Subject: Apology for incomplete work
Respected Sir/ Madam,
I am ________ (mention your designation) of ________ (name of the company).
This letter is in reference to the complaint we have received for the product delivered in regard to __________ (mention order ID). Respected, as per the complaint received, the delivered product was __________ (mention – not functional/ broken/ any other).
We apologetically write this to inform you that the product would be ________ (delivered/ replaced/ repaired/other) by __/__/_____ (date) along with the compensation. I apologize for the inconvenience.
Respected, the same would be fixed by __/__/____ (date). I believe you would accept my sincere apology. We look forward to serving you better and have a good business relation with you in the coming future.
For,
________ (Company Name),
________ (Signature),
________ (Name),
________ (Contact Number)
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Sandeep Bhandari 
Deepanshu Thakral