Starfaith how is cancelling a visa illegal? and just as Bleu said, the sponsor does not have to issue an NOC.

The sponsor can cancel any visa he likes, without reason anytime he likes. All he has to do is take the passport to immigration, cancel the visa and thats it. Why would it be illegal for him to do so?

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"Diplomacy is the art of saying 'Nice doggie' until you can find a rock - Will Rogers"