Contacte a linha de avarias, assim como o técnico.

Contacte is the formal singular command of the verb contactar in European Portuguese.

It is the form you use when speaking to:

• você
• o senhor
• a senhora

So this is not the casual tu form.

A quick comparison:

• tu → Contacta
• você / o senhor / a senhora → Contacte
• vocês → Contactem

In European Portuguese, affirmative commands for você usually use the same form as the present subjunctive, which is why you get contacte.

Here, a is simply the definite article meaning the.

So:

• a linha = the line
• o técnico = the technician

It is not a preposition here. The verb contactar takes a direct object, so Portuguese does not need an extra preposition before the thing or person contacted.

So:

• Contacte a linha = Contact the line
• Contacte o técnico = Contact the technician

Linha de avarias is a common service or utility expression meaning something like:

• fault line
• breakdown helpline
• service fault number
• repairs/fault-reporting line

The noun avaria means:

• fault
• breakdown
• malfunction

So linha de avarias is the phone line or department you contact when something is not working properly, especially with things like electricity, internet, water, or appliances.

In this sentence, assim como means as well as or and also.

It links two things that should both be contacted:

• a linha de avarias
• o técnico

So the idea is that both are included.

Here it is not being used in a comparative sense such as just as. It is simply adding another element.

A very close paraphrase would be:

• Contacte a linha de avarias e também o técnico.

Yes. In fact, e would often sound more natural in everyday Portuguese.

So this version is simpler and very natural:

• Contacte a linha de avarias e o técnico.

Using assim como sounds a bit more:

• formal
• written
• careful
• slightly heavier in style

So both are possible, but e is usually the more straightforward choice in normal speech.

The comma makes the second part feel a bit more like an added remark or an extra item being appended.

So:

• Contacte a linha de avarias, assim como o técnico.

can feel slightly more formal or stylistically marked than:

• Contacte a linha de avarias e o técnico.

With expressions like assim como, punctuation can vary depending on style and rhythm. The comma is not impossible here, but many learners will find the sentence easier to understand if it is rewritten with e.

Portuguese very often uses the definite article with nouns where English might not think about it as much.

So o técnico means the technician, usually a specific technician already known from the context.

For example, it may mean:

• the assigned technician
• the technician from the company
• the technician previously mentioned

Saying just técnico here would sound less natural in a normal full sentence.

It is grammatically possible and understandable, but it sounds a bit formal and slightly stiff.

A more everyday version would usually be:

• Contacte a linha de avarias e o técnico.

If you want to keep a formal tone, you could also say:

• Contacte a linha de avarias, bem como o técnico.

That said, assim como is not wrong. It just feels more written and less direct than e.

Yes, contactar and its form contacte are standard in European Portuguese.

A learner may also come across contatar and contate, but those are more associated with Brazilian usage.

So for Portugal, the safest choices are:

• contactar
• contacte
• contacto as a noun, depending on context

If you are focusing on Portuguese from Portugal, contacte is the form you should learn here.