RBL Bank — I want to cancel my credit card, customer care are not doing it

Website:

www.consumercomplaints.in/new_complaint/#

Hi, I have asked many times to the customer care executives to cancel my card, they did not, now I had to pay annual fees of rs 3538.82
I want to cancel my card immediately, I have already paid the annual charges, I do not want to pay that much amount for no reason, why are they not cancelling my card? I will have to take legal steps this time if they refuse to cancel my card
Please look into this matter