Citi Bank — Fraud on credit card

My Citibank credit card number [protected] got expired on June 2020, and bank had issued new credit card ending with 0077 on my registered address but as I have moved to out of country since then I couldn’t receive new card. But I am receiving statements on new card numbers .So till Oct 2020 I was making payment through my bank account on old card([protected]) and it was accepting payment.

But January 2021 I tried to clear outstanding balance and made payment through my bank account but I got bounced back.
So from January I was unable to make payment, even I had word with one of Customer service they told me kindly raise your concern bank will waive off interest and fees whatever have been charged after January.but so far I have not got any revert from bank, no reply since last 2 years, only third party keep calling me for payments.My cibil score also got decreased because of this who is going to take that responsibility.