Take screenshot of that offer screen and sent the mail to grievance redressal team asking for millenia specifically. Tell them the reason that it would be more useful for you.
Quote them your relationship with the bank like from how long you've been their customer or high no. of txns you do. If everything goes by your side, they'll issue millenia.
Coz Moneyback is a trap. They don't upgrade it easily. And Tata Neu card is cobranded. Specially paid tata Neu card isn't worth it.