I have closed my credit card 5 month ago, but they didn't proceed the request and generate bill with charges, i didn't made any transaction after submit request. Sometime call center confirm that my card is closed and sometimes they denied. So i have email to support center and they confirm that my card is closed and when i requested to close card that time i don't have outstanding amount. But still hdfc generate bill with additional charge every month.
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-Manoj
HDFC Bank Customer Assistance