Nataka kurejesha muamala.

• Nataka = I want
• kurejesha = to return / restore / reverse
• muamala = transaction

So the structure is:

I want + to reverse/return + transaction

In natural English, this is often understood as I want to reverse the transaction or I want to return the transaction, depending on context.

In Swahili, ku- is the infinitive marker. It works a lot like English to before a verb.

• kurejesha = to return / to restore / to reverse
• verb root: -rejesha

So after nataka (I want), Swahili uses the infinitive:

• Nataka kurejesha... = I want to return/reverse...

Because the idea of English to is already built into kurejesha through the prefix ku-.

English says:

• I want to reverse the transaction

Swahili says:

• Nataka kurejesha muamala

So ku- already does the job of to.

Ninataka is the fuller form, and nataka is a very common shortened form in everyday Swahili.

So both can mean:

• Ninataka = I want
• Nataka = I want

Learners often see ninataka in textbooks because it shows the verb structure more clearly, but nataka is extremely common in real usage.

The core meaning of kurejesha is to bring back, to return, or to restore.

With muamala (transaction), it usually means something like:

• to reverse a transaction
• to undo a transaction
• sometimes to return a transaction, depending on the situation

So the exact English wording depends on context, especially in banking, mobile money, or customer service.

Swahili does not use articles like English a, an, and the.

So muamala can mean:

• a transaction
• the transaction

The context tells you which one is meant.

That is very normal in Swahili.

The plural of muamala is miamala.

• muamala = transaction
• miamala = transactions

So:

• Nataka kurejesha muamala = I want to reverse the transaction
• Nataka kurejesha miamala = I want to reverse the transactions

Yes. If the context already makes it clear what you are talking about, you can leave it out.

For example:

• Nataka kurejesha huu. = I want to return/reverse this one.
• Nataka kuurejesha. = I want to return/reverse it.

In the full sentence, though, muamala makes the meaning explicit and is often clearer.

Yes, it is quite similar here.

Swahili:

• Nataka
  • kurejesha
    • muamala

English:

• I want
  • to reverse
    • the transaction

So for an English speaker, this sentence is fairly straightforward in word order: subject meaning inside the verb + infinitive verb + object.

A more polite or softer version would be:

• Ningependa kurejesha muamala. = I would like to reverse the transaction.

You could also hear:

• Naomba kurejesha muamala. = I request to reverse the transaction / Please let me reverse the transaction

If you are speaking to customer service or in a formal setting, Ningependa... often sounds more polite than Nataka....