Dear _____________ (name)

This is to acknowledge that we are in receipt of your notice whereby you informed us that the goods shipped to you on ______________ (date) did not conform to our agreement dated ____________ (date).

We regret this unintentional mistake on our part, the reasons for which were _________________________________________________ (explanation).

While we recognize that the time for performing under this agreement has expired, we are requesting that you extend the time to _____________ (date) in order that we may cure the defect by replacing the shipment with goods that conform to our agreement.

Please accept our apology for this inconvenience. We will be looking forward to your response.