CC Avenue — Lodging complaint on financial fraud

Yesterday a person has made payment on Utilities CC Mumbai from my grandfather's bank account fraudlently. He said his name is Ravikumar and said he is calling from Indian Bank. But later when my grandfather ignorantly gave all the debit card details, we are getting a message that Rs 30000 was spent on Utilities CC mumbai. Payment was made around 4.30 pm.
We have registered a complaint in Cybercrime.
Date Of Incident : 29/07/2020
Mobile number from which we got call : [protected]
I would like to know more about this person's transaction and if there was any purchase, i request you to stop shipping and refund the amount to the bank account. And i get that its a problem which should be looked up by police and bank, but i request you to help as we have suffered a big financial loss. I'll attach the photo of my bank statement.
Please do the needful. Its the only account of income for my parents and they are aged 80+.