Llamé al servicio posventa.

Llamé is the 1st person singular preterite of llamar: I called.

• llamo = I call / I am calling (present)
• llamé = I called (completed action in the past)
• llamaba = I used to call / I was calling (imperfect, more ongoing or habitual in the past)

In Llamé al servicio posventa, the speaker is talking about one completed phone call in the past, so llamé is the natural choice.

In Spanish, a + el normally contracts to al.

So:

• a el servicio posventa → al servicio posventa

This is a standard contraction, just like:

• Voy al banco
• Escribí al director

The only common exception is when el is part of a proper name, for example:

• Voy a El Escorial

But here el servicio posventa is not a proper name, so al is required.

The verb llamar when it means to call someone / to phone somewhere often uses a before the person or entity being called.

So:

• Llamé al médico = I called the doctor
• Llamé a la oficina = I called the office
• Llamé al servicio posventa = I called the after-sales service

That a is part of how the verb connects to its object in this meaning.

Spanish often uses the definite article where English might not.

So al servicio posventa literally looks like to the after-sales service, but in natural English we usually just say the after-sales service or after-sales support, depending on context.

Including el here sounds normal and idiomatic in Spanish.

Servicio posventa means after-sales service, after-sales support, or sometimes customer support after purchase.

It refers to help provided after you buy a product or service, such as:

• repairs
• returns
• warranty issues
• technical support
• installation problems

In Spain, posventa is a very common word in business and customer-service contexts.

In modern Spanish, posventa is normally written as one word.

It is formed from:

• pos- = after-
• venta = sale

So posventa = after-sale / after-sales

You may also see postventa in some contexts, but posventa is the preferred standard form in current usage.

The accent mark in llamé shows both pronunciation and meaning.

Compare:

• llame = a different form, such as a subjunctive or formal command-related form
• llamé = I called

The accent tells you the stress falls on the final syllable: lla-MÉ.

It also helps distinguish this past-tense form from other forms of the same verb.

In most of Spain, llamé is pronounced approximately like ya-MEH.

A rough guide:

• ll usually sounds like y in many parts of Spain
• a = like a in father
• mé = stressed meh

So: ya-MEH

Depending on the region, the ll sound can vary a little, but ya-MEH is a good practical approximation for most learners.

No. Llamar has several meanings, including:

• to call / to phone
  
  • Llamé al hotel
• to be called / to be named
  
  • Me llamo Ana
• to call out / to summon / to attract attention
  
  • Llamó a la puerta can mean He knocked at the door, literally something like He called at the door

In this sentence, llamé clearly means I phoned / I called.

Yes. That would use the present perfect:

• Llamé al servicio posventa = I called the after-sales service
• He llamado al servicio posventa = I have called the after-sales service

In Spain Spanish, the present perfect (he llamado) is especially common for actions connected to the recent past or to a period that is still considered current, such as today.

So in Spain, both can be correct, but the choice depends on context.

Yes, Spanish word order is more flexible than English, but this sentence uses the most neutral and common order:

Verb + object/complement

• Llamé al servicio posventa.

You could sometimes move things for emphasis, for example with extra context:

• Al servicio posventa llamé yo, no al técnico.

But in ordinary speech, the original order is the most natural.

Yes, depending on the situation. Some common alternatives are:

• atención al cliente = customer service
• soporte técnico = technical support
• servicio de atención al cliente = customer care/service
• departamento de posventa = after-sales department

But servicio posventa is a very natural choice when talking specifically about support after a purchase.

It is neutral.

Nothing in Llamé al servicio posventa is especially formal or informal. It would sound normal in:

• conversation
• an email
• a complaint
• a story about something that happened

If you wanted to sound more formal in a longer sentence, you might add context, but this sentence by itself is standard and neutral.