I opened a hdfc digisave account back in 2020. now i have over 1 lakh mab on the account. i went to the bank to upgrade it to hdfc classic they're telling me that i need to make a new hdfc account with the 25k mab one and they'll move it to classic and thay digisave account is only for students and cant be upgraded to classic. is this true? should i close this account and make a new account?