gogaek senteoga obaesonggwa nurageul hwaginhaessseupnida.

가 is the subject marker. It shows that 고객 센터 is the thing doing the action of 확인했습니다. In other words, the customer service center is the one that confirmed something.

You could also see 고객 센터는, which would mark it as the topic instead. That would still be grammatical, but the nuance would shift slightly.

오배송과 누락 is one combined noun phrase meaning misdelivery and omission/missing item. The particle 과 links the two nouns, and the object particle 을 is attached once at the end of the whole phrase.

So:

• 오배송과 누락을 확인했습니다 means
• confirmed the misdelivery and the missing item/omission

This is very normal in Korean. You do not need to put 을/를 on each noun in a simple list like this.

Korean uses:

• 과 after a noun ending in a consonant
• 와 after a noun ending in a vowel

오배송 ends in ㅇ, which counts as a consonant ending, so 과 is correct: 오배송과.

오배송 means a wrong delivery or misdelivery. In shopping or shipping contexts, it usually means that the wrong item was sent, or the delivery was made incorrectly.

It is a common customer-service word:

• 오 = wrong, mistaken
• 배송 = delivery, shipping

누락 means omission or something left out. In a delivery context, it often refers to a missing item that was supposed to be included but was not.

So here, 누락 probably means that part of the order was missing. It sounds more formal and business-like than a casual everyday word.

Korean nouns usually do not mark singular and plural as clearly as English nouns do. So 누락 could refer to:

• one missing item
• multiple missing items
• the issue of omission in general

You figure that out from context, not from the noun itself.

확인했습니다 comes from the dictionary form 확인하다, which means to check or to confirm.

It breaks down like this:

• 확인하- = confirm/check
• -였- / -았- contracted here as 했 = past tense
• -습니다 = formal polite sentence ending

So 확인했습니다 means checked or confirmed in a formal, polite style.

It can mean either, depending on context. 확인하다 often covers both ideas: checking something and verifying that it is true.

In this sentence, confirmed is often the most natural translation if the meaning is that customer service verified the problem. If the focus is more on the act of looking into it, checked can also work.

Yes. It sounds formal and business-like. That comes from both the vocabulary and the ending:

• 오배송, 누락, and 확인 are formal/service-related words
• -습니다 is a formal polite ending

This is exactly the kind of style you would expect in customer-service messages, notices, or company communication.

Yes, you will often see 고객센터 written as one word in real-life usage, especially on websites and in company menus. The spaced form 고객 센터 is still understandable because it clearly shows the parts 고객 and 센터.

For learners, the important thing is to recognize both forms as referring to the same idea: the customer service center.