Translation: This is an internal mistake on our part, and I sincerely assure you that I will personally inspect every detail of each batch of goods to ensure that the same thing will not happen again!
This is our internal mistake. I sincerely guarantee that I will check every details in person for each batch of products to ensure similar problems not happening again.
This is our internal mistake, we sincerely apologize. We will ensure to inspect every details in person for future shipments in order to oid such mistakes.