https://www.hdfcbank.com/personal/pay/cards/credit-cards/tata-neu-infinity-hdfc-bank-credit-card/fees-and-charges
This offer is NOT applicable for existing customers.
Is this true ??
Is it not when you upgrade and get a new debit card , your old debit cards get cancelled and you will be only having one debit card active at a time for a account , instead of having all 3 debit cards as you mentioned ??