IDFC Bank — IDFC Bank IDFC misusing flipkart paylater customers

IDFC has provided Rs.1, 500 as my paylater monthly credit, after few months later when i checked my Cibil score, i was shocked to fine that IDFC had late payments( Rs.508 for Dec'2020) and i lost 100+ points from my cibil score due to this false reporting. Me and flipkart have my payment history which shows all the payments were on time. I have noticed a foul play here and would like to take this as high as possible, if we just think about the masses of the people involved in flipkart paylater, we can guess what big a scam this is. I would like to have a resolution on this as soon as possible.

Can anyone please tell me how to approach RBI or other institutions governing malpractices in Banking sector in india?