Thay vì đợi, tôi gọi ban quản lý ngay.

Thay vì means instead of.

It is used to show that one option is chosen over another:

• thay vì + verb phrase
  Thay vì đợi = instead of waiting

• thay vì + noun phrase
  Thay vì taxi, tôi đi xe buýt. = Instead of a taxi, I take the bus.

In this sentence, Thay vì đợi introduces the action that was not chosen, and the main clause tôi gọi ban quản lý ngay gives the action that was chosen.

Because the subject is understood to be the same as the subject in the main clause: tôi.

So:

• Thay vì đợi, tôi gọi ban quản lý ngay.

naturally means:

• Instead of waiting, I called/call the management right away.

Vietnamese often omits repeated subjects when they are obvious from context.

If the subject were different, you would usually state it:

• Thay vì đợi tôi, anh ấy về trước.
  = Instead of waiting for me, he went home first.

So in your sentence, leaving out the subject after thay vì is normal and natural.

Đợi means to wait.

It is very close in meaning to chờ, which also means to wait. In many everyday sentences, they are interchangeable:

• đợi xe buýt
• chờ xe buýt

Both mean wait for the bus.

A few notes:

• chờ is often felt to be slightly more common in everyday speech
• đợi is also very common and completely natural
• in some contexts, one may sound a little more regional or stylistically preferred, but the difference is usually small for learners

So Thay vì đợi could also be Thay vì chờ without changing the core meaning much.

Vietnamese verbs do not conjugate for tense the way English verbs do.

So gọi always stays gọi, whether the action is present, past, or future. Time is usually shown by:

• context
• time words
• aspect markers such as đã, đang, sẽ

For example:

• tôi gọi = I call / I called / I am calling
• tôi đã gọi = I called / have called
• tôi sẽ gọi = I will call

In your sentence, the exact time depends on context. On its own, it can be understood as something like:

• Instead of waiting, I called the management right away
• or Instead of waiting, I call the management right away

If you want to make the past clearer, you could say:

• Thay vì đợi, tôi đã gọi ban quản lý ngay.

Ban quản lý means something like:

• the management
• the management board
• the administration
• the people in charge

The best English translation depends on context.

For example, it could refer to:

• the management of an apartment building
• the management office of a complex
• the administration of a facility
• a governing or organizing board

So in this sentence, gọi ban quản lý means to call the management / the management office / the people in charge.

No. In ban quản lý, ban is a Vietnamese noun meaning something like:

• board
• committee
• department
• administrative group

So ban quản lý is a fixed expression meaning management board or management.

It has nothing to do with the English verb to ban.

This is a good example of why it helps to learn whole Vietnamese chunks, not just single words in isolation.

Ngay here means immediately, right away, or at once.

In tôi gọi ban quản lý ngay, it adds urgency and tells you the action happened without delay.

Vietnamese adverbs like this often come:

• after the verb
• or after the object
• depending on style and focus

So these are both possible:

• Tôi gọi ngay ban quản lý.
• Tôi gọi ban quản lý ngay.

The version in your sentence is very natural. Ending with ngay gives a clear final sense of immediacy: I called the management right away.

The comma separates the introductory phrase Thay vì đợi from the main clause tôi gọi ban quản lý ngay.

So the structure is:

• Instead of waiting,
  • main statement

This is similar to English punctuation.

In short sentences, Vietnamese punctuation can sometimes be flexible, but the comma is very natural here because it makes the sentence easier to read and clearly marks the fronted phrase.

Sometimes yes, but not always naturally.

Vietnamese often drops subjects when they are obvious from context. However, in a standalone sentence like this, keeping tôi is the clearest and most natural choice:

• Thay vì đợi, tôi gọi ban quản lý ngay.

If you remove tôi:

• Thay vì đợi, gọi ban quản lý ngay.

this can sound more like:

• an instruction
• a note
• an incomplete sentence
• or a context-dependent subject omission

So for a normal self-contained statement, tôi is better.

The main clause follows normal Vietnamese word order:

• tôi = subject
• gọi = verb
• ban quản lý = object
• ngay = adverb

So:

• tôi gọi ban quản lý ngay

follows the common pattern:

• Subject + Verb + Object + Adverb

Before that, you have the introductory phrase:

• Thay vì đợi

So the full structure is:

• [Introductory contrast phrase] + [main clause]

This is a very common Vietnamese sentence pattern.

Yes, it is natural.

It sounds clear, neutral, and grammatical. A native speaker might still change it slightly depending on context:

• Thay vì chờ, tôi gọi ban quản lý ngay.
• Không đợi nữa, tôi gọi ban quản lý ngay.
• Thay vì đợi, tôi gọi ngay cho ban quản lý.

These all express a similar idea, but your original sentence is perfectly normal.

One small context note: if the situation is very specific, speakers may make ban quản lý more precise, for example:

• ban quản lý tòa nhà = the building management
• ban quản lý chung cư = the apartment management
• ban quản lý công ty = the company management

But as a general sentence, ban quản lý works fine.