Cheapticket.in / Airtickets India — undesired cancellation

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Kolkata, West Bengal, 700034

I had booked a ticket for my uncle and his family for 22nd august, 2018 from kolkata to dibrugarh.. Flight no a1705, booking id 4143096.. The passengers are anjan dey, bela dey and arindam dey... But i wanted to know the cancellation procedure for only 2 passengers out of 3 as bela dey and arindam dey won't be able to take the flight but the entire ticket was cancelled, much to my despair. I had then mailed immediately to the autborised agent not to cancel but there was no response from their side...