Az ügyfélszolgálat köteles kivizsgálni a panaszt.

The sentence breaks down like this:

• Az ügyfélszolgálat = the customer service / customer service department
• köteles = is obliged / is required
• kivizsgálni = to investigate
• a panaszt = the complaint

So the structure is:

subject + predicate adjective + infinitive + object

Literally, it is something like:

The customer service [is] obliged to investigate the complaint.

Hungarian often leaves out is in this kind of present-tense sentence.

Because Hungarian often omits the verb van = to be in the present tense, third person when linking a subject to a noun or adjective.

So:

• Az ügyfélszolgálat köteles. = The customer service is obliged.

The is is understood.

But in other persons or tenses, Hungarian does use the verb:

• Köteles vagyok. = I am obliged.
• Köteles volt. = He/she/it was obliged.

So this omission is normal and very important to get used to.

Az is the definite article, meaning the.

Hungarian has two forms of the:

• a
• az

Which one you use depends on the following sound:

• az before a vowel sound
• a before a consonant sound

So:

• az ügyfélszolgálat because ügyfélszolgálat starts with a vowel sound
• a panaszt because panaszt starts with a consonant sound

This is similar to a/an in English, but Hungarian does it with the definite article instead.

It is a compound noun:

• ügyfél = client, customer
• szolgálat = service

Together, ügyfélszolgálat means customer service or customer service department.

Hungarian uses compound words very often, so it is useful to learn to spot the parts inside long nouns.

Köteles is an adjective meaning:

• obliged
• required
• bound to

In this sentence it works like a predicate adjective:

• Az ügyfélszolgálat köteles = The customer service is obliged

So even though English might use must or has to, Hungarian here uses an adjective plus an infinitive.

This word is especially common in formal, official, or legal-style language.

Because after köteles, Hungarian normally uses an infinitive to say what someone is obliged to do.

The ending -ni is the infinitive marker, like English to + verb:

• vizsgálni = to investigate / to examine
• kivizsgálni = to investigate fully / to look into thoroughly

So:

• köteles kivizsgálni = is obliged to investigate

This is a very common pattern in Hungarian:

• köteles megtenni = is obliged to do it
• köteles fizetni = is obliged to pay

The prefix ki- often gives the sense of doing something fully, thoroughly, or to completion.

So:

• vizsgálni = to examine / investigate
• kivizsgálni = to investigate thoroughly / fully look into

In the context of a complaint, kivizsgálni sounds very natural, because complaints are usually not just glanced at — they are properly investigated.

Hungarian verb prefixes are very important, because they often change the meaning in ways that English expresses with extra words.

Because panasz is the direct object of kivizsgálni, so it takes the accusative ending -t.

• panasz = complaint
• panaszt = complaint as a direct object

So:

• kivizsgálni a panaszt = to investigate the complaint

Hungarian marks many objects with a case ending, while English usually relies more on word order.

Again, it depends on the following sound:

• az ügyfélszolgálat because ügyfélszolgálat begins with a vowel sound
• a panaszt because panaszt begins with a consonant sound

So the rule is:

• a
  • consonant sound
• az
  • vowel sound

This is purely about pronunciation, not grammar meaning.

It is singular.

Hungarian treats it as one unit: a department, office, or service function.

So:

• Az ügyfélszolgálat köteles... = The customer service is obliged...

Even if in English we sometimes imagine customer service as a group of people, Hungarian grammar still treats ügyfélszolgálat as a singular noun.

Yes, Hungarian word order is flexible, but changes usually affect emphasis rather than basic meaning.

The neutral version is:

• Az ügyfélszolgálat köteles kivizsgálni a panaszt.

This presents the information in a straightforward way.

A different order could emphasize something else, for example:

• A panaszt köteles kivizsgálni az ügyfélszolgálat.

This puts more focus on the complaint.

So Hungarian word order is not random. It is strongly connected to what is already known, what is being emphasized, and what the speaker wants to highlight.

Not exactly.

Both can express obligation, but they feel different:

• kell = must / have to
• köteles = is obliged / is required / is legally or officially bound to

So köteles is usually more formal and often sounds more official, institutional, or legal.

Compare:

• Az ügyfélszolgálatnak ki kell vizsgálnia a panaszt. = Customer service must investigate the complaint.
• Az ügyfélszolgálat köteles kivizsgálni a panaszt. = Customer service is obliged to investigate the complaint.

The second version sounds more formal and rule-based.

This word has several sounds that are unfamiliar to English speakers:

• ü = a front rounded vowel, similar to German ü or French u
• gy = a soft palatal sound; there is no exact English equivalent, but it is somewhat like a very soft dy
• sz = English s
• zs = the sound of s in measure

A rough learner-friendly guide for the whole word is:

ügy-fél-sol-gaa-lat

But that is only approximate.

Also remember: Hungarian stress is normally on the first syllable of each word:

• AZ ügyfélszolgálat KÖteles kivizsgálni a PAnaszt

Learning the exact sounds takes practice, especially ü and gy.

Not really.

A very literal translation would be:

The customer service obliged to investigate the complaint.

But natural English needs is:

The customer service is obliged to investigate the complaint.

So when translating from Hungarian, you often need to supply forms of to be that are not written in the Hungarian sentence.

That is one of the most common things English speakers need to remember with Hungarian present-tense sentences.