HDFC issuing life time free upgrade to super premium credit cards such as infinia and diners black. User specific. Login to your net banking and check for upgrade option. If upgrade is available then make use of it. Please ensure with your RM or customer care whether it is LTF or not. 10X rewards is absolutely superb in these cards
https://www.desidime.com/discussions/hdfc-issuing-life-time-free-upgrade-to-super-premium-credit-cards-such-as-infinia-and-diners-black-user-specific?page=1#post_7283849
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