HDFC automatically changed my Diners ClubMiles card to HDFC Bank Millennia Credit Card

Recently, HDFC automatically changed my Diners ClubMiles card to HDFC Bank Millennia Credit Card on its own. I never requested the upgrade/ switch and HDFC did it on its own. That's a bad act. 

HDFC Diners ClubMiles Card had pretty good rewards so I loved it but this millennia card is basic junk and I fail to understand what's the incentive for HDFC to do this.

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