Le service client répond à la réclamation.

Service client is a standard expression meaning customer service. Here, client works like a descriptive noun, a bit like an adjective in English.

So:

• service client = customer service
• not service of the client

If you said service du client, it would sound more like the client’s service, which is a different idea. Another common phrase is service clientèle, which means almost the same thing.

Because the subject is le service client, which is third person singular. The verb répond is the il/elle/on form of répondre in the present tense.

Present tense of répondre:

• je réponds
• tu réponds
• il / elle / on répond
• nous répondons
• vous répondez
• ils / elles répondent

So Le service client répond = Customer service responds.

Because répondre normally takes à before the person or thing you are answering or replying to.

Examples:

• répondre à une question = to answer a question
• répondre à quelqu’un = to answer someone
• répondre à une réclamation = to respond to a complaint

So répond à la réclamation is the correct structure. You normally do not say répond la réclamation.

Because réclamation is a feminine singular noun, so it takes la.

French contractions with à work like this:

• à + le = au
• à + les = aux
• à + la = à la
• à + l’ = à l’

Since it is la réclamation, you get à la réclamation, not au.

French uses articles more often than English does. In this sentence, la réclamation most naturally refers to the complaint in question, the one already known from context.

So even if English might sometimes say something shorter or more generally, French often prefers:

• répondre à la réclamation rather than leaving the article out.

Yes. In everyday French, especially in business or customer-service language, une réclamation usually means a complaint or sometimes a claim.

It is a bit of a false friend for English speakers, because English reclamation usually means something different, such as recovering land or restoring something. In this sentence, réclamation definitely means a customer complaint or formal complaint.

Yes, they matter for the articles.

• service is masculine → le service
• réclamation is feminine → la réclamation

That is why the sentence uses le and la. The genders do not change the verb form here, though. The verb agrees with the subject in person and number, not in grammatical gender.

A rough pronunciation is:

luh sair-vees klee-ahn ray-pon ah lah ray-klah-ma-syon

A few helpful points:

• répond: the final d is silent
• répond has a nasal vowel, so it does not sound like English pond
• client is roughly klee-ahn
• réclamation ends with -syon

A more precise IPA pronunciation is:

/lə sɛʁvis kli.jɑ̃ ʁe.pɔ̃ a la ʁe.kla.ma.sjɔ̃/

It can mean either, depending on context. The French present tense often covers both the English simple present and present progressive.

So this sentence could mean:

• The customer service department responds to the complaint
• The customer service department is responding to the complaint

Context tells you which English version is best.