Bill paid for closed credit card

Had done the same thing few years back as the old card was saved. Don’t worry it will get credited to your new account

I had done payment to old Citi Bank and it got credited to new account

Paid for my old money-back card instead of new Millenia. It got credited to new account

For HDFC it will be credited to your new/migrated card. It happened a few months back.. it may take 2-3 days rather than an instance reflection on the credit card statement

made same mistake with BoB card today. Does it get credited to the new card?

For old credit card payment it credited to your account no worries about the funds