RBL Bank — KYC update / credit card cancellation

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RBL credit card. Mumbai

I was called by RBL customer care last year and they offered me a card upgrade option. while receiving a new card they did not block my old card and a new card is an added card that I really don't need. after receiving the new card I came to know that my registered email id is wrongly mentioned. Hence I can not send an email to customer support to update the email id or block my card. because they are looking mail from registered email id. There is no use by calling toll free number. I never experienced such a worst customer support ever.