RBL Bank — credit card closure not done

Address:

Malad west, Mumbai City, Maharashtra, 400095

Request of closing the credit card was already placed on 4th of april 2019, but till date there is no proper response. I keep on calling and informing the same for the closure, but no proper response. 1st reference # 07377612 was closed without informing, 2nd is still under review ref # 07509250. But i haven't got any single call from them for the closure of the credit card. By now i have made 10 calls for the closure of the card, but every-time i have got the fake assurance
I am fed up of calling and informing the same thing to the different caller. They keep on promising me it will be closed, but till date it has not happened yet.
I wonder they are simply buying the time and waiting for the next statement to be generated, so that i will be charged for the annual fee.
I would request someone to take some action against rbl credit card department who is unnecessary harassing the customer.