this wont happened...i tried.....if u had any core hdfc card u could have got tata neu card not vice versa.....after getting my tata neu plus card...i mailed nodal officer to give me a millenia as well.....but they didnt agreed...so i requested to convert my card to millenia ltf....but since my limit was less than 1 lakh...they agreed to convert it to moneyback plus ltf...i took it......many tried after seeing my post....but none have been succesful....u can try if u want to convert to millenia ltf