Στο υποκατάστημα της γειτονιάς με εξυπηρετούν πιο γρήγορα, γιατί το αίτημα δεν μένει για μέρες εκκρεμές.

Στο is a contraction of σε + το.

• σε = in / at / to
• το = the for a neuter noun

So στο υποκατάστημα means at the branch.

This is extremely common in Greek:

• σε + το = στο
• σε + τη(ν) = στη(ν)
• σε + τα = στα

So the first part, Στο υποκατάστημα, means at the branch office.

Υποκατάστημα means branch or branch office, for example a bank branch or local office of a company.

It is a neuter noun:

• singular nominative: το υποκατάστημα
• singular accusative: το υποκατάστημα
• singular genitive: του υποκαταστήματος

Because it is neuter singular, it takes το in the nominative/accusative.

της γειτονιάς is in the genitive case.

• η γειτονιά = the neighborhood
• της γειτονιάς = of the neighborhood

So το υποκατάστημα της γειτονιάς literally means the branch of the neighborhood, but in natural English we would usually say the local branch or the neighborhood branch.

Greek uses the genitive a lot where English often prefers an adjective or a different phrasing.

με here is the unstressed object pronoun meaning me.

So:

• με εξυπηρετούν = they serve me / they help me / they process me more quickly

In Greek, weak object pronouns usually go before the verb:

• με βλέπουν = they see me
• με ξέρουν = they know me
• με εξυπηρετούν = they serve/help me

This often feels unusual to English speakers, because English puts me after the verb.

The verb εξυπηρετούν is 3rd person plural: they serve / they help.

Greek often leaves the subject unstated if it is understood from the verb ending. So there is no need to say αυτοί.

Here, the implied subject is something like:

• the staff
• the employees
• the people there
• simply they

So με εξυπηρετούν πιο γρήγορα literally means they serve/help me faster.

εξυπηρετούν is the present tense, 3rd person plural, from εξυπηρετώ.

Basic forms:

• εξυπηρετώ = I serve/help
• εξυπηρετείς = you serve/help
• εξυπηρετεί = he/she/it serves/helps
• εξυπηρετούμε = we serve/help
• εξυπηρετείτε = you all serve/help
• εξυπηρετούν = they serve/help

In this sentence it has a practical sense: they handle me / they take care of my request more quickly.

γρήγορα means quickly / fast.
πιο γρήγορα means more quickly / faster.

So the sentence is making a comparison:

• not just they help me quickly
• but they help me faster

The comparison is understood from context: faster than at another branch, or faster than elsewhere.

In modern Greek, πιο + adverb/adjective is the normal way to make the comparative:

• πιο καλά = better
• πιο αργά = more slowly / later
• πιο γρήγορα = faster

Here it is an adverb, because it describes how they help.

• γρήγορος / γρήγορη / γρήγορο = quick, fast (adjective)
• γρήγορα = quickly, fast (adverb)

Since it modifies the verb εξυπηρετούν, Greek uses the adverb.

Yes, γιατί can mean either:

• because
• why

In this sentence it clearly means because:

• ..., γιατί το αίτημα δεν μένει...
• ..., because the request does not remain...

Context and punctuation make the meaning clear.

Examples:

• Γιατί άργησες; = Why were you late?
• Άργησα γιατί είχε κίνηση. = I was late because there was traffic.

Το αίτημα means the request or the application/request submitted.

It is a neuter noun:

• το αίτημα = the request
• του αιτήματος = of the request

In this context it likely means an official request, service request, or application being processed.

Yes, μένω commonly means:

• I stay
• I remain
• sometimes I live

Here it means remain:

• το αίτημα δεν μένει... εκκρεμές
• the request doesn’t remain pending

So μένει is being used in the sense of stays/remains in a certain state.

Very common pattern:

• μένω ανοιχτός = remain open
• μένω ήρεμος = remain calm
• μένει εκκρεμές = remains pending

για μέρες means for days.

This is an idiomatic Greek way to express duration:

• για ώρες = for hours
• για μέρες = for days
• για εβδομάδες = for weeks

No article is needed here. It means an indefinite period of that length, not specific days.

So:

• μένει για μέρες εκκρεμές = it stays pending for days

εκκρεμές means pending, unresolved, or still open.

It agrees with το αίτημα, which is neuter singular, so the form is also neuter singular:

• masculine: εκκρεμής
• feminine: εκκρεμής
• neuter: εκκρεμές

So:

• το αίτημα είναι εκκρεμές = the request is pending
• το αίτημα δεν μένει για μέρες εκκρεμές = the request doesn’t stay pending for days

Yes, δεν μένει εκκρεμές για μέρες would also be possible.

Greek word order is more flexible than English. The original order:

• δεν μένει για μέρες εκκρεμές

puts a bit of emphasis on the duration for days before giving the state pending.

Both versions are natural, but the original has a nice flow and slight emphasis on the idea that it does not drag on for days.

Literally, it is they serve me faster or they attend to me faster. But in real usage, εξυπηρετώ often means:

• help a customer
• process someone
• handle someone’s case
• attend to someone

So depending on context, this part could be understood as:

• they help me faster
• they process my case faster
• I get served faster

It is a very common service/customer-context verb.

Yes. It breaks down very naturally into:

1. Στο υποκατάστημα της γειτονιάς με εξυπηρετούν πιο γρήγορα

   • At the local branch, they help/serve me faster

2. γιατί το αίτημα δεν μένει για μέρες εκκρεμές

   • because the request doesn’t remain pending for days

So the second part explains the first: the service is faster because the request does not sit unresolved for days.

It is mostly neutral and quite natural.

Some words are a bit more administrative or service-related:

• υποκατάστημα = branch office
• αίτημα = request/application
• εκκρεμές = pending

So it sounds like normal educated everyday Greek, especially in a context involving banks, public services, telecom companies, insurance offices, and similar institutions. It is not overly formal, but it is definitely not slang.