Flipkart — Not received my refund of cancelled product.

I had ordered poco m2 pro on 18/10/2020 and i had cancelled it on the same day .So flipkart told me to get the refund by 23/10/2020.But i have not received any payment yet.
They have said that any further delay contact the bank service. I have contacted the bank service but they are refusing that their is nothing of such deal.
I have also tried to contact flipkart help center but could not able to find anything satisfactory.
I am requesting flipkart to please take action against it.As it is a very serious matter.
Hope you will reply to my query.
My order reference number is
onus20201019
Amount to be credited
12999
Please please take action against it.