तुरंत फोन कीजिए ताकि बैंक कार्ड ब्लॉक करे।

तुरंत means immediately, right away, or at once.

It is an adverb, so it describes when the action should happen. Putting it at the beginning gives the sentence a sense of urgency:

तुरंत फोन कीजिए = Call immediately

Hindi often places time adverbs near the beginning for emphasis, though word order can be somewhat flexible.

In Hindi, many borrowed words from English are used with करना to make a verb phrase.

So:

• फोन करना = to call / to phone
• ब्लॉक करना = to block
• मैसेज करना = to message

That means फोन कीजिए literally comes from फोन करना, using a polite command form of करना.

So the structure is:

• फोन = phone / call
• कीजिए = please do

Together: फोन कीजिए = please call

कीजिए is a polite imperative form of करना.

It is used when speaking respectfully, for example:

• to a customer
• to a stranger
• in formal instructions
• in polite advice

Compare:

• फोन करो = call (informal, to one person you know well)
• फोन कीजिए = please call (polite/respectful)
• फोन करें = please call / do call (also polite, often in formal or written language)

So this sentence is speaking politely to the listener.

ताकि means so that or in order that.

It introduces a purpose clause. In this sentence, it shows the reason for calling:

• तुरंत फोन कीजिए = Call immediately
• ताकि बैंक कार्ड ब्लॉक करे = so that the bank blocks the card

So the full idea is:

Call immediately so that the bank can block the card.

After ताकि, Hindi often uses the subjunctive form, because the action is a goal, purpose, or intended result, not simply a plain fact.

So:

• करे = may do / should do / can do, depending on context
• करता है = does / is doing habitually
• करेगा = will do

In purpose clauses, करे is the normal choice:

• ताकि वह आए = so that he comes / may come
• ताकि मुझे मिले = so that I get
• ताकि बैंक कार्ड ब्लॉक करे = so that the bank blocks the card

So करे here does not mean a present habit. It expresses the intended outcome.

This is very common in modern Hindi. Hindi freely uses English loanwords, especially for technology, banking, office language, and everyday urban speech.

Examples:

• बुक करना = to book
• चेक करना = to check
• ब्लॉक करना = to block
• कॉल करना = to call

So ब्लॉक करे is just the verb phrase ब्लॉक करना in the subjunctive form.

This is completely normal Hindi usage, especially in practical situations like banking.

Because कार्ड is the direct object of ब्लॉक करे, and in Hindi, direct objects—especially inanimate ones—often do not take को.

So:

• कार्ड ब्लॉक करे = block the card

You may also hear:

• कार्ड को ब्लॉक करे

That is possible too, but को is not required here.

In general, को is more strongly expected with people, animate beings, or sometimes with specific/emphasized objects.

Hindi often leaves out words that are understood from context.

In a situation like this, it is obvious that the instruction is about your card, so आपका can be omitted.

So:

• बैंक कार्ड ब्लॉक करे = the bank blocks the card
• बैंक आपका कार्ड ब्लॉक करे = the bank blocks your card

The second version is more explicit. The first is shorter and still understandable if the situation is clear.

Good question. In the sentence as written, the object of फोन कीजिए is not stated explicitly. It is understood from context that you are supposed to call the bank.

Hindi often drops obvious information, especially in short instructions.

But if you want to make it fully explicit, you could say:

तुरंत बैंक को फोन कीजिए ताकि बैंक कार्ड ब्लॉक करे।

Or more naturally:

तुरंत बैंक को फोन कीजिए ताकि वह आपका कार्ड ब्लॉक कर दे।

So yes, बैंक को is omitted in the original sentence because the context is assumed to make it clear.

The sentence is understandable, but many native speakers would probably say it a bit more naturally as:

तुरंत बैंक को फोन कीजिए ताकि वह आपका कार्ड ब्लॉक कर दे।

Why is this version more natural?

• बैंक को फोन कीजिए makes clear whom to call
• वह avoids repeating बैंक
• आपका कार्ड makes the meaning more explicit
• ब्लॉक कर दे often sounds more natural for a completed action like blocking a card

So the original sentence is fine as a short instruction, but the expanded version sounds smoother and more idiomatic in everyday Hindi.