שירות הלקוחות בודק תנועה חשודה בחשבון.

This is a Hebrew construct chain (סמיכות): שירות + הלקוחות.

Literally, it is something like service of the customers, but in natural English we usually say customer service.

So:

• שירות = service
• לקוחות = customers
• שירות הלקוחות = customer service / the customer service department

This kind of noun+noun structure is very common in Hebrew.

In a construct chain, the definiteness of the whole phrase is usually shown on the second noun.

So:

• לקוחות = customers
• הלקוחות = the customers

Because the second word is definite, the whole phrase שירות הלקוחות becomes definite too.

That is why Hebrew says שירות הלקוחות, not usually השירות הלקוחות.

In English, this may still be translated simply as customer service, even though the Hebrew phrase is grammatically definite.

Because the subject is שירות הלקוחות, and the head noun of that phrase is שירות.

• שירות = singular masculine
• לקוחות = plural, but it is not the grammatical head of the subject

So the verb agrees with שירות, not with לקוחות.

That is why we get:

• שירות הלקוחות בודק = customer service checks / is checking

not a plural verb.

בודק is the present tense form.

In Hebrew, the present tense often comes from a participle-like form, and it can mean either:

• checks
• is checking

So שירות הלקוחות בודק תנועה חשודה בחשבון could mean:

• Customer service checks suspicious activity in the account
• Customer service is checking suspicious activity in the account

The exact meaning depends on context.

Hebrew uses את before a definite direct object, not before an indefinite one.

Here, תנועה חשודה means suspicious activity / a suspicious transaction, which is indefinite.

So:

• בודק תנועה חשודה = checks suspicious activity

But if it were the suspicious activity, then you would expect את:

• בודק את התנועה החשודה

So the lack of את tells you the object is not definite.

Yes. תנועה literally often means movement, motion, or traffic.

But in financial or account-related contexts, תנועה can mean:

• transaction
• account activity
• entry/movement on an account

So in this sentence, תנועה חשודה is best understood as something like:

• suspicious activity
• a suspicious transaction

The exact English wording depends on context.

Because it describes תנועה, and תנועה is a feminine singular noun.

Adjectives in Hebrew must agree with the noun they describe in:

• gender
• number
• definiteness

So:

• תנועה = feminine singular
• חשודה = feminine singular adjective, meaning suspicious

If the noun were masculine singular, you would expect חשוד instead.

בחשבון is made from:

• ב־ = in
• חשבון = account

In normal unpointed Hebrew spelling, בחשבון can represent either:

• in an account
• in the account

The difference is clearer only with vowel marks:

• בְּחשבון = in an account
• בַּחשבון = in the account

In everyday writing, Hebrew usually leaves out vowel marks, so context tells you which one is meant. In this sentence, it most likely means in the account.

Yes. This sentence uses a very common subject–verb–object order:

• שירות הלקוחות = subject
• בודק = verb
• תנועה חשודה = object
• בחשבון = prepositional phrase

So the structure is basically:

Customer service + checks / is checking + suspicious activity + in the account

Hebrew can use other word orders too, but this one is very natural and straightforward.

Yes. חשבון is a flexible word and can mean different things depending on context, such as:

• account
• bill
• calculation

Here, because the sentence talks about תנועה חשודה and something being checked in the account, the meaning is clearly account, most likely a financial account or bank account.