This letter is to acknowledge that we were in receipt of ones notice whereby you informed us that this goods shipped (transport service) to you on (date…) did not conform to our contract dated (specific date…).
We regret this unintentional blunder on our part, exactly why for which were (explain causes…).
While we notice that the time for carrying out under this agreement offers expired, we are requesting you extend the time to (date….) so we may cure the defect by replacing the shipment (transport) with goods (product name) that conform to our agreement.
You should accept our apology just for this inconvenience. We are looking forward to your response.
Name…Designation with signature…