Indusind Bank — indusind bank is not cancelling my credit card

I have been allotted a aura credit card on no fees terms by indus ind bank by their representative sitting at ahmedabad. After one month they started charging me fees for card and interest which has amounted to about rs 600 or so even though i have paid card fee of rs 100 which i supposed not to be charged. Now i want cancel my aura credit card of indus ind bank on priority. Customer care representative cannot be connected as phone always remains on busy tone. Ahmedabad representative is not responding even with rigorous
Follow up. Pl help me in closing/cancelling my said credit card.