How to write reply letter against a complaint letter ?

Dear Sir,

With reference to your communication dated the __________________ . We hereby state that your letter has not so far been received by us; otherwise we would have supplied the items required. However, we are making arrangements to dispatch all the machines required within two days and will send the same to you by the goods-train. Railway Receipt will be sent

We have taken care to supply the best machines as asked for.

With regards,

Yours faithfully,

Complaint-Letter-against- ...

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