RBL Bank — Credit Card account has not been closed.

I had made full payment of my credit card on 22feb 2020. After that, I called on customer care service to close my credit card account number permanently. RBL CCE said that you'll get a confirmation msg from RBL CARD. But after 4 months I have not received any confirmation msg and mail. I have received SMS for making a payment of card dues when I have not used card after 22Feb 2020 and submited a request of close the credit card account, so why I am getting SMS for bill dues. I called to RBL Bank Customer care for giving a request again to close the credit card permanently but they did not any respond on call or mail. I am very disappointed with this.