Dear Sir or Madam:
I am very regretful to hear that the quantity of the shipment wasn't in line with that stipulated in the contract.
We have studied the investigation report you sent to us and checked with the clerk who was responsible for your order, and we have to confess that due to our negligence we have made the mistake and it is against our contract. We are now arranging shipment for the rest of the consignment and we will inform you of the delivery date when it is settled.
We extend our sincere apologies for any inconvenience you have experienced.
Dear Ms. Li,
Thank you for your reply. We appreciate your disposal regarding this incident.
We would like to establish a long business relationship with you, since we can see you are a responsible partner through this incident.
Dear Ms. Li，
Thank you for your reply and we are willing to accept your apology for the incident. We are looking forward to the early delivery of the rest of the order.
Thank you for your cooperation.