HDFC Bank — Credit card finance charges reversal

I was charged hefty amount of finance charge on my credit card. Later on I contacted my personal banker for it after lot many attempts. I even sent many mails to hdfc. Finally after several talks my personal banker agreed to reverse about[protected] back on my cards account by 14-21 June 2020.
Later on today it’s been almost 2.5months I have been trying to contact her and even her manager but none of them is picking any call. In this span I have made more than 100 calls to both of them but they are unresponsive. When it’s their responsibility they step back. I request the person incharge on this medium to help me out ASAP.