HDFC Bank — Credit card Bill

Hi sir,
I have mailed numbers of time to hdfc bank credit card team in last 4 month but still they are not replying.
They have upgraded my old moneyback credit card to ragilla but not delivered to me which cause my previous card in blocked state and i did not get the the statement for bill for that month to pay at right time. So i sent an email for this issue and they sent a manual statement late which cause late fee and interest and tax charges. After that i sent again an email for this issue a month back but they did not replied. I followed up multiple time. I have all the mail which i sent but they yet not replied.
Pleas help me as they are adding late fine and interest every month without resolving the issue and all the issue is from hdfc bank side only.
Please do the needful.